Product review (4 stars): Good, but what I really needed was a less expensive ice maker valve...
This works well and was pretty easy to install.  Unfortunately, I should have done more research before purchasing this to figure out what my real problem was, as this didn't solve it.  My icemaker was producing a relatively small quantity of poor quality cubes -- often hollow, sometimes small, etc.  It turns out the problem was not the icemaker itself, but the water inlet valve.  I also purchased this through Amazon (Whirlpool 4318047 Ice Maker Valve).  It was much less expensive than the icemaker itself, also pretty easy to install, and completely solved the problem.  As I now understand it, it's pretty common for these valves to clog or fail over time.  Youtube is a great source of trouble-shooting information and fix-it-yourself advice - wish I had spent a bit more time educating myself there before jumping to conclusions and purchasing something I didn't need.