Product review (4 stars): Yes, $20 more but I think it is worth it.
I bought the off-brand GE filter to replace the filter that came with my refrigerator and was happy not paying nearly double. The difference though, I believe, is the taste.  There is a slight taste to the water using the Water Sentinel brand and it got increasingly noticeable as the filter aged.  I could be wrong so I bought the GE brand again so I could pay more attention, but overall, I don't think I'm entirely wrong.  It is a shame these cost so much, but I happen to like filtered water.