I bought a Panasonic to replace my 20 year old microwave. My previous oven, like many, cycled between on and off to deliver lower power levels, whereas the Panasonic Inverter technology has true continuous power levels and works much better than the older technology.
I bought a 1.6 cu. ft. model, one size down from the largest 2.2 cu. ft., with a spin dial instead of the traditional 10 digit keypad for time entry, which I like. The only thing I would have preferred is a squeezable handle to gently close the door. My model has a push release to open, and closing is basically slamming the door shut.
Whatever size and model features you get, the Inverter cooking technology is excellent. I don't know about long term reliability, of course, as mine is only 3 years old.
This is the model I have:
Panasonic NN-SD797S Oh, and the stainless steel "Fingerprint Resistant finish"? NOT!
Steve