I had no annoyning issues in the months of running my Mark 2 on 1.03. I had iddues from time ot time of the dimmer starting out dim, but was fine once it booted. Hugo has said it's an odd hardware glitch causing that one, I'm not too worried about it. The only problems I have had have been with 2.0, but of course it's beta. (And the inteferrence to the keyless remote system that still baffles me to this day, but it's not an issue on the MK2a I now use).
And the system can be powered down at anytime except when emplode is syncronizing to it. The normal data is never mounted read write, and their custom partition can handle powerdowns at any time. Running carbuilder will erase all partitions and rebuild the primary disk. Normally such a drastic step is not needed though.