Product review (5 stars): It Works
The problem with water flow was the original valve sticking only partway open. It now takes about 5 seconds to fill a 12-ounce glass. Before replacement, the old valve was passing so little that it took almost a full minute to fill the same glass.

Although it was a pain to install thanks to Whirlpool's lousy instructions (the fridge maker, not the maker of this valve), it works great.