Product review (5 stars): No worries !!
Was going to give it four stars since the only way I have to test filtering is anecdotally by tasting it and judging water flow to the GE OEM.  But, I tasted it against my tap water and it tasted noticeably better just like the OEM one.  And I don't recall the original filter tasting any better than this filter.  The filter's papers say "material & components tested and certified by WQA Gold Seal against NSF/ANSI Standard 42 and Standard 53 for the reduction of substances listed below according to Standard 42 and Standard 53."  Cantamination Reduction for Chlorine Taste and Odor had average reduction of 97.1% (NSF Reduction Requirements say greater than or equal to 50%.  Nominal particulate Class I, greater than or equal to .5 to less than 1.0 micrometer average % reduction was 99.8%  with NSF reduction requirements of greater than 85%.  So if you believe their numbers, it passes no problem.  Anecdotally, my water flow seems to be about the same as the OEM when it was new.  My refrigerator is a GE Purifier Performance (older, "Water by Culligan") and water here in Indianapolis, IN is decent (comparatively).  I am wondering where the person who gave this filter bad marks for taste lives, as it definitely is fine for here.  I also wonder if the person who said the filter doesn't fit their refrigerator understands that the original filter was modified to work better (model changed) and required an adapter for some refrigerators (newer refrigerators don't need it).  It is easy to see if this is the case simply by unscrewing your original filter and  looking to see if the new filter's connection looks the same.  The filter was EASY to install, with absolutely no difference with the one I took off.  Didn't need to mark anything or make things complicated. But again, my refrigerator is a GE Purifier Performance, and perhaps other models are different.  The filter is also supposed to have water pressure between 30 and 80 (can be used at higher pressure with a pressure limit valve, if that's the only way you have to limit the pressure), so perhaps people have problems arising from that?  Water was also clear from the get-go with no black filter bits and clear water, so I dunno.  All I know is, I was a bit leery of buying a 'knock off', but having taken the chance, I am currently more than satisfied.  Barring any unforeseen problems/changes I will definitely purchase again, probably the three pack instead of just one.