Product review (5 stars): Go with the name brand
I bought an off brand first, and returned it.  It was horrible.  This one worked great right from the start.  Ran the required amount of water through to prime it, and the water tastes .  The price here was good, too.  I won't bother trying off brands for this again, I will just order the Frigidaire from now on.  On a side note, I do not replace them as often as you are supposed to.  I use mine for quite a long time.  Maybe they don't filter as well then, but the water tasted fine.