Product review (5 stars): GE MSWF Refrigerator Water Filter
Our OEM GE MSWF Refrigerator Water Filter (say that five times fast!) has lasted from May 2010 until now, April 2011. The ice and water we get from the this filter through our fridge is always clear and tastes great, although I have to say our tap water is quite acceptable on its own, so your own filtered water's taste may vary from ours.

The filter we bought in May 2010 installed easily and has obviously lasted a long time; I'm purchasing a replacement through here today as these are still more expensive in the local stores.

Update March 2012
The filter we purchased in April 2011 just gave us the warning light, saying it's reaching the end of its life. Quality control seems pretty good on this filter...each has lasted about 11 months with frequent water & ice usage.