Product review (2 stars): Zero NSF certifications
Pro:  These are cheap and they fit.

Con:  These have absolutely zero NSF certifications.  The packaging says "tested to NSF 42 standards" and nothing about NSF 53.  For those who don't know, NSF 42 is the "aesthetic" certification (for things like choline, taste, etc) whereas NSF 53 is the certification for "health" (things like parasites, lead, etc).

So, if all you care about is how your water tastes and how much money you are spending, go ahead and buy these.  Even then, they didn't bother to pay for the NSF 42 certification so you have to take them at their word that the filter meets those standards.  If, on the other hand, you value a filter that actually removes harmful things from your water, suck it up and buy the OEM cartridge.