I actually like this feature better than the original Roomba filters -- ...
347488
These filters have a mesh cover over the intake side which the 2 filters that came with the 805 do not.  I actually like this feature better than the original Roomba filters -- makes them a lot easier to clean.  They do seem to fit a touch looser than the original filter, but not by much.
2178319
Two points: Seems more durable than the manufacturer's Neato filters as the filter is plastic rather than paper. It takes longer to wear out. The Neato does not seem to pick up as much dirt as with the other filters. Perhaps 10% less. Maybe the airflow is less; I don't know. However, given the difference it price; I can live with it!
3281083
The top notch is square rather than rounded off like the OEM. I plan to change the filters at least once a quarter.  I have been extending the like of the filter in use by blowing it out with compressed air every couple weeks as part of the normal Roomba preventive maintenance.
1398982
Works really well.  When I replaced this filter, the suction of the vacuum vastly improved (like new).  Our floor rugs used to lift off the floor when the vacuum was new but gradually decreased (even tho I regularly wash the pre-filter sponge).  Replacing this filter greatly increased suction.  Filter seals are easy to attach: 2 half circle foam seal with self-adhesive.  I will plan to replace this filter more often.

My only issue was that one set of my filters was missing its foam seals.  The package appears that it may have been opened before and resealed (possibly been a return).  I figure that when I use the second of these filters, I will reuse the seals from the first filter.
4085873
You can also find this filter at Target stores.  It includes two triple-ply filters and a foam filter on top of those to catch the large particles like dust and cat or dog hair.  It has three levels of action, but I put it on high as I like the `white noise' that it provides, as it helps to put me to sleep.  Although you are supposed to replace the filters at 90-180 days, I simply take my vacuum cleaner attachment and reverse suck the small particles from the filters, making them last longer.  The foam filter on top is simply washed in the sink to remove the dust and hairs.  The ionizer also helps with musty smells and can be turned on or off.  In a large room, you don't need to be concerned about over-ionization or nitrous oxide problems.  It's good looking and provides a slight breeze, cleanliness, ionization and a `white noise'.  The filters are also not expensive, although I wish I could afford one that does not require replacement filters.  I could not sleep without one.
674826
I owned a Roomba about 7 years ago and lost it in a move. I'm looking to replace it because I miss it so much. It cleaned wonderfully. I'm a little ocd so I was concerned when it seemed to just wander around but it really does get everything up! It even went under the dressers which were too low for my vacuum to fit under. As an added bonus, my girls thought it was great fun to pick up their toys and put them away so that Roomba could run. When they were in school, I would just turn it on, go grocery shopping and have a nice clean floor when I returned!

Now for some just so you know facts: The Roomba's brushes did need cleaning out fairly often to remain at optimal efficiency. This could be because I and my children have very long thick hair which even clogs our regular vacuum. Cleaning is relatively easy with the tool provided.

At the time I first had my Roomba, replacement filters were hard to find but that seems to be solved now and there are really no other neegatives that I can think of.

Oh yes, iRobots customer service is incredible. I had a charging issue with my first model and they shipped me a new one at no cost with no hassle. All I had to do was ship back 1 part, postage prepaid, from the first one after I received the second one. I had no problems with that one.
756465
I've had the original Roomba for a few years, and recently bought this newer model. Self-recharging in it's "nest" is great.. no more forgetting to plug it in and finding a dead Roomba when you need it to clean up; when the battery is low, it finds its way home and plugs itself in. Spot Clean is neat .. Roomba will run in a tight circle to clean up something that you spilled in a small area. The dirt "sensor" works well too .. if Roomba is rolling around and notices heavy dirt in one spot, it'll pause there and give that spot a real thrashing. The mechanical design has really improved from the early days too. I looked the unit over very well, and it's definitely better engineered now; for instance, I noticed that the "side cleaning brush" is now straight in shape, and not hooked. The hooked brush sometimes would get tangled in carpet tassles. Lastly, I have to mention the vastly improved battery life. I'm very pleased to have upgraded to the new unit. It's far superior to it's brother, Original Roomba.
1591095
I highly recommend this product when you need replacement parts for your roomba. The product is identical as far as I can tell, but more importantly, it cleans as good as the original. It looks exactly like the original parts and I do not think anyone would be able to tell the difference in the two of they were side by side and you could hold them and feel them. But once again, all that matters is does it work, and the answer is YES. For this price, you cannot go wrong.

Update 12/4/17
I have now been using this for several months and felt the need to update my review.  I stand by the comment on quality.  However, there is one development that is worth noting.  The brush itself is somehow different from the original in that it collects much more hair and dirt on the brush itself.  It is then VERY hard to clean.  Once it is clogged, it is too thick to fit through the cleaning device that irobot provides, and you have to clean it by manually pulling all the hair and debris off of the brush.  The brush does work very well, but it just requires slightly more maintenance than the original due to the way it is designed. Therefore I am taking off 1 star and moving to 4 stars.
1556742
Works very well to filter out dust and such sucked into the vacuum cleaner, and leaves a nice Febrezee--zy smell in the rooms where you vacuum. I've washed out the old filter (also a replacement Febreze filter) to see whether I can reuse it.
2314014
The plastic mesh on the top of the filter seems nicer than the metal mesh on the original filter. It does reach 0 TDS as well, so price-wise is slightly better than the original.

My only issue with the filter is that it goes a lot slower than the original filter.
2672997
Better than original, which is these tiny filters, which can stop up too fast. I can see what's going on inside this filter and last a lot longer. Great.
2128385
I love my little Eureka upright, bought about 10 yrs. ago mainly for quick pickups and kitchen cleaning. And then there were no replacement filters to be found. The vac worked just fine and I disliked  buying a new one. I came right here to AMAZON. Luckily for me, they had a replacement filter that fit my upright. Unhappily, it costs twice as much as the old ones. I will say that they do seal better and have more suction, and they are suppose to last longer than the previous ones. This I doubt, at least in my case! We have pets, pets shed and that's where the filters all get clogged. The hair can't be shaken off or pulled off. I have to use a soft brush, and that naturally wears down the filter fibers. This is suppose to last 6 months before it needs replaced, but I doubt I'll do that. I think I'll just have to give in and buy another little upright, a new model, and maybe the filters won't become obsolete before I'm ready to let it go.
<a data-hook="product-link-linked" class="a-link-normal" href="/Genuine-Eureka-DCF-5-Filter-62130B-1-filter/dp/B002YCAA7U/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Genuine Eureka DCF-5 Filter 62130B - 1 filter</a>
1703892
I've only used the filters but find they need a thorough cleaning much quicker than the filters that came with my Roomba.
4562968
The filter seems to be effective and a good fit.  When comparing the color of my old filter to the replacement guide printed on it, it didn't seem like it was time to replace it yet.  I replaced it anyways, and was surprised at how much more air was flowing after the replacement was installed.

Remember that the units that use these filters are not designed for large areas.  I forgot to turn my purifier, which was on the low setting, off in the computer room one night, I was surprised at how fresh the air in the room was the next morning when I opened the door.  It goes to show that they really do work if they are used in the size room they are designed for, and these replacement filters are doing a good job.

My pre-filter was also old, and I believe that the larger particles it was allowing to pass through was what lead to my old filter having lower flow, even when it showed it wasn't time to replace it yet.  I recommend changing your pre-filter if you think it may be getting worn out at the same time you replace this filter.  They are inexpensive, so, you might as well do it at the same time to get all the benefits of your purifier.
855113
This is a replacement unit for the whole brush assembly, including 2 brushes, motor and dust sensor. Very easy to install - my 12 year old son swapped it with an old one without waiting for me, only need Philips screwdriver to remove cover and old assembly. Works as good as original one, or even better.  Not cheap, but to give second life to expensive vacuum is still much cheaper than replace the whole Roomba.
949365
I won't duplicate what others have said. On our hardwood floors Roomba does a better job than the top-rated cannister which we've been using. We have a good whole-house furnace filter and we don't get an enormous amount of dust, so I don't find that the Roomba dust tray fills up quickly. It's true that the Roomba needs minor regular maintenance (such as cleaning the brushes), but all vacuums need this, and they rarely get it. It is easier to perform that maintenance on a Roomba. Two things prevent me from giving it five stars. The first is that the product is still not very "smart." As the technology progresses it will surely not take 30 minutes to vacuum one room. The second is that iRobot has dismal customer service. The reps aren't familiar with the functions, haven't read the product manuals, and don't even know what is in the box. In short, it acts like the military contractor that it is.

Update: After a few weeks of use, several of the spinning arms that whisk out dust from wall edges have broken off. The only source of replacement is the manufacturer, and it is out of stock with about a month estimated shipping time. (iRobot's estimated shipping times are a joke.) If the arms break off at this pace they will represent a noteworthy maintenance expense. It's obviously for good reason that the replacement part is sold in a three-pack. One of the large wheels has now become very noisy but shows no sign of contamination interference. It is apparently broken. I'll get a replacement unit.  iRobot's tech support wait times, like other customer services, is unacceptable. Management clearly doesn't know how to provide service to back a good product.

Update 2: I've replaced the first defective unit. In two weeks the replacement has done fine, but I now have the gnawing concern that the product won't have a life span that justifies the price. The corner brushes already look worn. The Roomba does a good job of sensing and slowing down for object it sees head-on, but it hits corners and smaller legs pretty hard. I don't like the way it bumps into my floor speakers, so I'll have to protect them from it. The Lighthouses have no off switch, so the batteries are consumed even when they are not needed but the Roomba is working.

Update 3: The main brush on my replacement Roomba has slices in the rubber after three weeks and the side brush arms are quickly getting worn, so I have contacted iRobot: it wasn't easy. The phone menu claims to lead to tech support, but it never gives you the option of a live person. Grrrr. I called the corporate number and after I pitched a glitch they put me through to a more senior person who acknowledged that they have made phone support difficult so as to drive customers to the web site. Grrrr. He also said that there was a defect in the side brush which caused it to break easily, and sent me a new bottom and side brush at no charge. What about all the people who have bought and are still buying units with defective brushes? Will they have to call  impossible-to-reach tech support, slink back to the web site, and beg for a replacement? What about those who don't realize it is a defect and simply pay for replacement brushes?

iRobot's corporate number is 781-345-0200.

Feb 08 update: The battery has now lost what I estimate to be about 40 percent of its capacity. The manufacturer says this is not uncommon. They recommend a reset and a 72-hour charge. Service rep says that after that charge "if you get 5 or 10 more minutes that's a good sign." Not good enough, I think.
1106366
This is our second of this type. They made the controls better. It's quieter, too. This type of purifier is better for a smaller room (tall and thin), and also won't require you to buy new filters every 90 days.