Product review (3 stars): Oven: good.  Installation: very problematic.
I had an older GE microwave above my range that died after about 8 years.  When looking for a replacement I decided to go for another similar GE in order to swap it out easily, figuring it would use similar hardware.  That was my first mistake.

There's a steel plate used to mount the oven on the wall plus three big screws that go in from the cabinet on top.  Not only is the plate different (requiring removal of old & installation of the new), not only are the anchor points in different places (requiring new holes), but they're placed just marginally off the old anchor points.  Meaning that the integrity of the wood where you need to drill is compromised from the old screw holes.  It required me to install a whole new shelf in the upper cabinet as well as trying my best to fill the old stud holes with wood filler and hoping it would be strong enough when I re-drilled.

Here's the kicker... the installation hardware comes with butterfly screws as well as two thick wood screws for mounting to the wall studs.  Unfortunately, those two wood screws are made of very cheap & weak metal.  I pre-drilled guide holes as per the instructions, but when it came to screwing the screws in- the heads twisted right off on both of them (and I was careful with the second one after the first one broke).  The screws were already 3/4 of the way in, leaving me with no way to remove them and blocking the ability to try again in the same spot (a spot required for proper installation).  The oven isn't light, the installation requires heavy duty hardware, why ship the microwave with such crappy screws?

Lessons:

Buy your own mounting hardware.
When it comes to buying a replacement appliance, there's no value in nepotism.