Product review (5 stars): works well (just like GE MWF)
Purchased first one 6 months ago to replace a GE MWF filter (because GE was more expensive). No problems with the install. Prior reviewers mentioned different size o-rings/seals. I didn't have any issues with seals or leaks at all. I simply installed and followed the directions to flush the water.  Water tasted like with GE MWF.  For the first 2 days, the water flow was faster than with the MWF (when new).  But it settled to the same flow rate as the MWF, which is slower than I'd like. I'm due for a replacement and I'm going to buy another WSG-1.  Price actually went up about $1.50 from 6 months ago.