Taped Mule last night, MK4>Sonosax>Microtrack (24/48), and while I ran into a few of the already documented problems - for the most part everything turned out okay.
1st Problem:
The battery life is nowhere near what was originally advertised, but I guess most of us knew that already. I got roughly 3 hours and 25 minutes on a full charge (backlight off, input monitoring off, no phantom, 1/4" TRS input), which was unfortunately about 10 minutes too litle, as my Microtrack died right before the encore. Luckily the file saved just fine, and was opened with no problems at all in Wavelab.
2nd Problem:
Just as I'd expected, at exactly the 25 minute mark, the level meters went ballistic. Looked like I was recording a fireworks display at close range. However the display had no effect on what was actually being recorded. One thing though, even when working properly the level meters suck. Practically useless. I clipped twice (red indicator light) at the start of the 1st set, but the actual level wasn't but about halfway up.
Overall a pretty good first go 'round. I rebooted between each set as per Skalinder's earlier post, and had no issues with the unit freezing. I also had the correct "Record Time Remaining" display the whole time, not one instance of it counting forward, showing an incorrect time, etc.
With a couple more firmware updates I think this unit can be what a lot of us have been waiting for, whether it be a 24/96 DAT replacement, all in one stealth box, or simply a digital dump. I've got my fingers crossed the bugs get worked out, and see no reason to believe they won't.