Product review (4 stars): We like it, but instrallation is a headache.
First, let me say that the icemaker has worked for the week or so since I installed it.

Installation was an adventure.  My GE refrigerator said that this was the correct model for retrofit, and it was.  There was an installation section in the refrigerator manual and installation instructions in the  booklet that came with the icemaker.  I needed both.  Even after reading both sets of instructions and "walking" through the procedure, there were both missing steps and ambiguities.

Parts: There were two different fill cups - one that came with the refrigerator and one that came with the icemaker.  Fortunately, it wasn't too hard to decide which to use.  Connecting the water valve to the incoming water line requires a nut and ferrule for the compression fitting.  These are cheap, so it's not clear why they are not included.  It's lucky that I've done some plumbing before or I would not have even known what to buy at the hardware store.

Instructions: Both sets of pictures are poor and far too few.  For instance, there are indents in the refrigerator sheet metal for the water tubing from the wall and the tubing to the icemaker.  These indents are not labeled, but if you miss them, the access cover plate will crush the tubing.  Another example, there are two water tube inlets (again, one each with the refrigerator and the icemaker)- they look very different, but on closer inspection are actually equivalent.  There is too much leeway for location of the water line clamp (strain relief).  And the list goes on.

In all, it took about 4 hours for the installation, not including the time to head to the hardware store to buy the parts for the compression fitting.  Remember that the refrigerator is unplugged during the installation and the freezer is open part of the time.  It's a good idea to move the contents to another freezer if you have one.

The ice-making speed is very slow - about one cycle per hour.  That's seven ice cubes or so.

The ice bucket is just a bit tall, so you can't just remove it horizontally.  I don't know if this is intention or not, since you can reach in and grab a handful of cubes.  I think not, so this means loosening the screws that hold the icemaker to the inside panel of the freezer and raising the unit a bit.  This can be done, but I presume that eventually the weight of the unit and the vibration of the icemaking will result in the unit settling.

Finally, the unit does make some noise, and the manuals warn you that this is normal.  There is the sound of water flowing into the icemaker (about a couple of seconds) and the sound of the ice cubes falling into the bucket.  This becomes less loud as the ice bucket fills, and of course it only happens once an hour.

Having said all this, we're still happy we bought this.  It really is nice not to have to keep filling ice cube trays and dripping water between the sink and the freezer.

I hope to update this review after the icemaker has been in use for a few months.