... the main function of getting RO water has been fine. I need to take three stars off though ...
585538
I've had the device for a couple months now and the main function of getting RO water has been fine. I need to take three stars off though because of how absolutely frustrating maintenance on the membrane is.
If the top cap is not tightened, then you run the risk of a leak when filtering water. Unfortunately, this means when you have to try to take the cap off to check or replace the membrane, you need the strength of Hercules to even attempt this feat. The included cap wrench is a flimsy piece of plastic with threads that loosely fit over the cap. Thus, attempting to unscrew the cap with the wrench is futile.
Unless I find some other method of prying the cap off without damaging the threads (and risk a further leak), I effectively have a paper weight of an RO/DI unit when my reef tank needs a water change.
142512
Bought this filter to avoid having to constantly buy gallons of spring water at the grocery store.  Long story short, I used the filter for a short period of time before deciding to go back to buying spring water.  Im not going to go into detail about the unit's filtering capacity (you can get in-depth info from the product page); but here are some main take-away points.

Cons:

1) The biggest disappointment for me was the taste of the filtered water (not sure how much of this is due to the filter vs quality of the tap water).  In my opinion bottled water still tasted a whole lot better.
2) The other disappointment was the size of the unit.  My sink is average in size yet the filter takes up a lot more space than Id like to give up.  It just always seems to be in my way when washing dishes.
3) The filtered water comes out in a narrow stream (as seen in the product picture);  takes a while to fill up a glass.  Anyone, who is the slightest bit impatient, is going to get frustrated with this.

Pros:
1) The unit is REALLY EASY to install.  I've installed this filter on 2 different sinks.  Takes no more than a few minutes.  I haven't had any issues with it detaching from the faucet.

Considering that the filter is relatively inexpensive, you wouldn't be losing much by taking a gamble on this unit and assessing the taste of the filtered water for yourself.
3223945
Not sure if it's because I haven't gotten the hang of it yet, or if it's just not that good quality, but the water comes out very bubbly instead of frothy. But it was cheap so can't complain too much.
2824507
As a number of other raters have indicated, this filter is inexpensive, easy to replace, & improves the taste of water greatly. However, the fact that it doesn't remove fluoride is a drawback, especially since my public water agency is considering the addition of fluoride to our water, which I oppose. If they do, I may have to seek an alternative filtration system.
2417907
Been using one of these at work for several months and it works ok. The biggest issue is the part that screws over the bottle does not fit well. I'd like to give it four stars becuase its easier then pouring water out of a five gallon bottle but the fit issue is just huge. What do you want for just a few dollars? If you are thinking of buyin gthese for a home emergency situation use where you have to use bottled water, I would say do it.
3615544
I use this filter inside my 5 gallon Aqueon mini bow tank. I am generally pleased with it, but it doesn't keep my water "crystal clear" like some other filters brag. Of course, this is a budget filter, and I would recommend this product to a possible buyer. The spray bar attachment is a little cumbersome, so I just use the little directional spout attachment. The flow is not too strong for my galaxy rasboras, platy, and red cherry shrimp, and the filter is SILENT. Seriously, can't hear it at all unless I put my ear right above it. Also, the suction cups are really strong, so it's important to be careful when trying to take it out of your tank for cleaning. Overall, a good buy with some minor flaws.
2718034
Seems to be doing the trick with the hard well-water that is high in nitrates. Within 3 days, it was already a solid rusty orange-brown! Water was honestly sparkling clear - I thought they exaggerated in the ad and on the fish-blog. Glad to find something  to help the fish, besides going through bottles of Am-Quel! Maybe now, I'll be able to keep guppies. (my water has proven lethal to them, despite the Am-Quel and Tank-Safe and aquarium salt) The other community fish seem to feel better, besides being prettier in their clean water.
4393150
This is my first RO unit and it's working great. No leaks and 0ppm. My faucet connection adapter is leaking so it wouldn't be fair for me to comment on the output rate. In time I'll find another way to connect with better convenience. LiquaGen well worth the money.
591057
I'm using this on my RO reservoir.  I won't trust my tank to auto-top systems, but this has stopped me from flooding the garage with RO/DI water, so the wife is happy.  It's a little fragile, I've broken it a couple of times moving things around but CA glue has fixed it up no problem.
2068786
Water tastes great! Simple RO water systems left me with water that made me more thirsty for some reason...then I realized it was devoid of the good trace minerals that are naturally in fresh water. This system produces balanced clean water that leaves the body hydrated. A bit complicated with the number of filters add but iSpring makes it easy to replace parts.
1141267
We purchased this unit to supply clean water for a 75 gallon salt tank. I didn't try to hook this up to the kitchen faucet as it was going into the basement and dumping out into a food grade trash can. The unit was easy to install and worked properly right out of the box. Although this filter is not 'graded' for food quality I had to taste it! It actually tasted good, better than bottled water and much less TDS (total dissolved solids). My brother had just purchased a RO unit for his house that hooked up to the faucet, it too was a three stage but he paid over 500 without a extra reservoir tank. He brought some of his filtered water over to my house and we compared TDS with a calibrated meter, his was 0.74 and ours tested at 0.09. He agreed that ours even tasted better but again, I don't think its rated or designed for drinking? Either way, we have been drinking from it (filling 5 gallon water jugs) for over a year now and its been the best 130 bucks we have spent. No, we don't drink out of the garbage can, I just swap out 5 gallon drinking jugs and the garbage can is used to fill the fish tank.
For those that have never used a RO unit before, just be aware that it takes about 3 gallons of tap water to make 1 gallon of clean. Not complaining just don't freak out when you get your first water bill!
1079633
This is mostly what I was looking for, specifically trying to get away from so much plastic, which tend to add a bad taste. This Kanteen type is meant to fit in the normal bike cage bottle holder, but I could tell that it was going to get scratched up pretty quick using the aluminum tube-type of bottle holder. So I switched out my bottle holder with a plastic type (looks more like a cup holder), which works better with this 18 oz. Kanteen bottle.

Lastly, the rubber cap I hope will lose it's smell. There's that characteristic rubber tire smell in the little valve and while it doesn't taint the taste of the water necessarily, you can smell it as you drink so it's kind of the same thing. If you remove the top and taste the water, the water is fine. So maybe, over a short period of time, the top (rubber valve), will become scent free.
3205740
Just got it in the mail today. Works well and doesn't leak at the faucet, however, it took me four bandaids on one hand & two on the other to patch myself up after removing after use. I'm still going to use it because it serves it's purpose. I'll just have to use a towel to take it off the faucet when I'm done watering my plants.
3544866
I'm not sure why the mixed reviews on this.  An on-tap filter system is a pretty simple thing.  The previous model had a significant problem with it:  Even with two hands, it was nearly impossible to move the valve that switches between filtered and non-filtered water.  This one is a snap to switch with just one hand.  My thumbs will thanks me.  I noticed some complaints about the water spraying out too aggressively.  I'm not sure why this is an issue.  I did notice that my water glasses fill up noticeably quicker than the prior model.  As long as the thing doesn't explode, I'm very satisfied with it.

Update: The lever that switches between filtered and non-filtered broke under normal use.  The thing is worthless now.
4304110
I have had our water dispenser for about a month. I had some issues when I first received the unit. The pump would run continuously. I would have to turn the unit off then on again then it would stop. This issue appears to have corrected itself. The other issue that happens is the bottle doesn't empty completely there is maybe 20 ozs of water left in the bottom of the bottle when it stops pumping water. I just anticipate this and put the residual water where its needed. Otherwise, its been working fine.
69200
Seems to help make the RO water Alkaline, was originally very acidic at about 5.8 PH!
660440
My tap water at home isn't chlorinated so I don't normally need a filter bottle, but I bought these for a trip to Disney, so we didn't have to spend $3 or more per bottle on bottled water -- instead we could drink the chlorinated tap water, and then we could recycle them when done and not have to drag them home. They work pretty good other than 2 things. 1) The lid to the screw top cap is very flimsy and I had to tape mine on after the first day (and the lid is necessary to keep the bottle from spilling). 2) The last gulp of water in the bottle seems to bypass the filter so I got a shock of chlorine tasting water each time I emptied the bottle into my mouth.

If you can remember not to empty the last gulp from the bottle when drinking, it's worth the money, as the filter does remove the chlorine taste.