I have been using these filters and not had a problem.  I change the filter when it hits that first single-digit # because I have been told that if the filter doesn't get changed before it runs out, that's when you start to get that metallic taste to your water.  Once that happens the pipes need to be replaced (or replace the refrigerator).  I'm no expert, but (knock on wood) I've had my refrigerator for about 12 years now and it still works just like brand new and the water / ice are remarkably fresh tasting.