Product review (2 stars): Unit was very easy to install but defective and not genuine GE.
Not a Genuine GE part, though unit was very easy to install.  Coil underneath got VERY hot to the touch initially, got that funky electrical burning smell.  That seems to have gone away for now.  Not sure if the unit itself actually chills the tray or if the ice is forming from ambient freezer temperature.  12 hours later and it has created two runs of ice.  I had to manually push the first cubes off of the icemaker.

Update: 24 hours, it has made 3 runs of ice ice and will not fully eject ice.  Set up replacement with Amazon to try again.