I have a microverb, second one I have owned in the past 15 years. It does a great job for basic reverbs, has about a dozen or so room sizes. The midiverb is a full rack space (1U) that is essentially the same, but with more room choices and some added delays. Very simple to use with knobs for input gain, output level, and mix, these units are a great value. Since most of us now have delay pedals with tap tempo, our reverb units don't need a lot of extra features.
If you need a good reverb, this is an excellent choice.
To my knowledge, Jerry didn't use one.
"His job is too shed light, not to master"