A great alternative to 1" filters and the more expensive grille filters.
588650
These filters are an excellent option for anyone looking for a Honewell type grill media filter without wanting to pay the high price of the name brand filters. They are very high quality, and last as long as the more expensive option. I change then about every six months, which make them cost about the same as an equivalent 1" filter that would need to be replaced monthly, but perform much better.
1016709
Great price and a great alternative to a full blown CAI when paired with a high flow filter. I haven't been able to tell the difference when I replaced my AEM CAI with the above set up.
1369023
This filter is a good alternative the filter provided by Mercedes and seems similarly well-made.  A good substitute for the pricier Mercedes filter.
1162153
Although low in price, this kit is made as well as those costing lots more. The filters themselves are well constructed with metal rims, and the glass is well polished and symmetrically cut. Edge to edge sharpness is not present as it may be in higher priced versions, but knowing what these can do and working then into your own scheme will produce satisfactory results. he packaging is also nice. I am glad I took the chance and bought these.
2911822
The OEM filters are heavily over priced. These are an excellent alternative and we noticed the difference in the water immediatly. They came quickly and fit perfectly.
1765498
I like this filter instead of the stock filters.  The chrome finish is nice and the 17mm bolt will be great to remove next oil change.  I can't speak to the quality of the filter other than it's a K&N product.  It didn't cost much more (two-three dollars more) than a regular Fram or other stock replacement filter so for the finish, the brand-name and the socket end, it was money well spent and I'll continue to order and use them.
465104
These work just as well as the OEM filters, and at this price point you don't have to avoid replacement.
4451762
I am pleased with these filters  they look and perform like the original filters but are less expensive.
3339012
This is one case where I am glad that what was shipped was different from the "picture" I thought I was buying.  I assumed I was replacing an old-style Pur on-faucet filter with another example of the same, the one that screws onto the faucet with an adapter and begins to leak after a year or so.  (I was buying another because I have a great number of the filter cartridges already on hand.)  Instead, what was delivered was a significantly revised design which (fortunately for me) uses the same 3-stage filter cartridges.  The new unit snaps on and off the faucet instantly using a spring-loaded, O-ring-sealed adapter that "feels like" it will remain both secure and leak-proof and offers easy freedom of rotation into the bargain.  We shall see.  In the meantime, another improvement is the easy snap-open/closed filter bypass, which can be flicked with a pinky when both hands are full.  The whole kit is much easier to mount than the old one, and much easier to use.
3448857
I have had my share of hang back filter and canister filters over the years, I find this one to be one of my favorites in this price range. It is easy to use, clean and install. it not that loud at all and the self priming feature helps out a lot when its time for maintenance.
2009342
These have worked great so far.  I don't have any way to verify that the filter performance is as stated, but I really like the fact that I can retrofit these in many of my existing filter registers (which only support 1" thick filters).  If they last the claimed 6 months compared to 1 month for a standard 1" filter, they're a great value.
2585570
Being in the automotive business I'm anal about what I choose to put on my car. Perhaps it's also a slight case of O.C.D.. After doing extensive research on other filters I stumbled across this filter which looks a lot like the O.E. Toyota filter. There are subtle differences in the two but this NPN filter appears to be constructed better than many of the aftermarket choices out there. There are some companies who don't machine the filter housing too well and the scarey thing is that I've seen metal shavings in some. This one passes the visual and physical test. It's heavier than some others which sometimes means there is more filtering media. It appears to be machined well. It's relatively inexpensive. I'd use this one if I couldn't make it out to the dealership to pick up an O.E. filter.
478123
As much as I hate the price on these filters, I love the fact that they actually do a good job of filtering. A lot of the cheaper off brands are pretty much worthless.
1544823
Simple and economical filtration system that works well.
941438
I replaced a stock Yamaha filter with this Uni and I could not be happier. Along with being dual-stage, it is MUCH easier to fit on the metal tube on my 2007 Grizzly 660. The stock foam filter is way too close fitting - it's easy to tear them if your oil gets too tacky before getting it on all the way. There's no need to have it fit that way, and the Uni fits comfortably.

There is a little downside - the gasket is far too thick for this application. I had to carefully slice it in half to allow it to fit. Maybe it's manufactured to fit varying boxes, but I'm still happy with the filter and the neoprene gasket works better than the stock foam version (which you cannot buy separately - come only with the metal tube!).
355013
Great filters.  I can change the filter more often because the price is reasonable too!
304327
Other reviewers are correct in pointing out that these aren't exactly the right size. However, thats mentioned in the measurements and fine print rather than in the title. These are great. They fit, they do their job, and are incredibly affordable. Purchasing this size at a local hardware or HVAC store can run $30 PER filter. So, I'll take the small size difference for how well they work.