Product review (2 stars): Was initially very pleased with how it worked
Bought this RIM300 kit to replace the failed OEM ice maker in my early 1990s GE top freezer fridge (came with IM2 ice maker kit installed).  Visually, it looked very similar, right down to horizontal bar used to regulate ice production.  It came with a variety of fill cups and choice of either round or rectangular plug wiring harness (mine used round).  Very straightforward installation.  Removed old/reinstalled new in reverse order.  Took all of 20-30 minutes.
Was initially very pleased with how it worked. Would have given it 5 stars after first installed. As quiet as the original, and made good quality half crescent ice cubes.  Could not have been happier for first 8-9 months.
Started making noise at the end of 8th month.  Evolved to a harsh grinding noise like it was struggling to eject the cubes.  Production slowed down and cube size became noticeably smaller.  Since complete failure seemed imminent, and the unit was out of warranty, time to replace.
Was initially going to purchase another RIM300 since it worked so well, at first.  However, after taking a close look at others' reviews, decided against it.  Too many similar to my own experience.  Instead, I opted to buy the 'Genuine GE Factory Part' ice maker kit also available on Amazon.  Cost twice as much, but I'm thinking it's going to be the better bet over time, especially since the original GE ice maker lasted so long.