I've had my MT since March - taped maybe 20 shows. Never an issue with it not caused by human error.
Runs great with my AT853 thru the SP battery interface which runs the input through the 1/4" jacks. Mic preamp isn't bad, unless it's a dead quiet show, in which case an outboard preamp is a good idea. Meters are easy to use once you get used to them, buttons are easy to find in the dark.
I don't mind the 2GB limit - I just find a good spot to hit the rec button twice - five seconds at most. I don't run digi-in, so I can't comment on usage as a bit bucket.
The ONLY real nit is battery life, and with my powerrunner 2200 I get a total of nine hours starting with both fully charged. I'd like a smaller batter pack that can use regular alkalines, but I can live without.
For all the complaints heard in these forums about this and that, I've had nothing but positive experiences.