I have used my Micron live on a few occasions, but I don't gig.
However, I would say the Micron is gig-worthy, except for the older main control knob spindle that used to be plastic, but is now metal. It's a soldly built, metal case unit. I would think of using this live for pads, or distinctive lead sounds, or DEEP bass, or in those times when you want an electronic beat. You don't need more octaves to achieve those ends.
I love my Micron. You should play one in a store though to see how it feels...
Thinking laterally, I find that the old E-MU synth modules have GREAT sounds out of the box that make for fantastic leads, basses, pads. All you need then is a MIDI controller, and you can get M-Audio 49 or 66 key versions for not much money at all. You'd have to go on ebay, spend $250-$350. or one of the modules (X-LEAD,
X-LEAD TURBO, PROTEUS 2000, ORBIT3). I have
an Orbit 3, loaded with extra ROMs and have thousands of sounds in a 1" rack unit.