I've installed five GE JVM1540 Over-the-stove microwave ovens in apartment units that I manage. Four of five responded to an e-mail poll I sent out this evening. All four said the microwave met their expectations. The oldest unit was installed in August 2007.
Recommend this product?
I picked the JVM1540 because the metal undercarriage looks like it can provide adequate protection to the electronic circuits when a tenant forgets to put a pot on top of a gas burner. Earlier units of some manufacturers had plastic parts that would melt nearly instantly.
I also picked the JVM1540 because it has a reasonably strong door hinge. If the hinge gets bent, the door doesn't latch right, and the oven will not turn on.