Wow - I feel like I asked a reasonable question now!!
Thanks for adding to the FAQ (and thanks for doing the FAQ in the first place! +t)
As to the overheating question: now that I'm using it as my "set and go" recorder, it's sometimes running for 3hrs at a stretch in a closed bag (handbag I use as a gear bag) and as yet hasn't heated up enough to shut down. In fact, yesterday was the only recording issue I've had with it since some teething problems when I first installed rockbox. I'd say that the heating/long run time issue is far less a problem than with the JB3, at least in my experience so far.
Agree with the assessment on the pre - it's entirely serviceable, if not brilliant. Warmer than the Reactive I use with the JB3. Sorry - you said ADC rather than pre. (need more coffee). Didn't I read somewhere once that the iRiver and JB3 actually use the same ADC circuitry?
HTH.
And thanks again to all who have responded in this thread - I record full length shows (eg operas) and then have to delete them to make space for hte next one - I do this a lot, so this is very very HELPFUL!