Got mine on Friday and recorded my band two nights in a row using the Dual/Line function (recording mic-in and line-in to separate files). This is the first recorder I've bought since using the Iriver H120 for many successful years. I'll share my thoughts on the DR-2D.
Let's start with the good. The overdub and Dual functions work well. The audio quality is great, noticeably better than the Iriver, even though I used an external preamp with both (better converters). The unit is easy to use.
Now the bad. The battery life is a f-ing joke. I put in what I thought were my best NIMH batteries for night one and got about 30 seconds of recording before the low-battery warning came on and shut off the recording. Switched to the alkalines that came with the unit and got maybe an hour--missed quite a bit of the show. On night two I had the same thing happen with the rechargeables. This time I was prepared with a bunch of new Energizer Max backups. I only got about 3 hours on a set of them and ended up not recording a song before I noticed and put another pair in. I don't know, maybe this was because I had it set for NIMH internally, but whatever, it still sucks.
While I'm griping, the unit is significantly larger than my H120, barely OK for pocketing. If you're going to be doing a lot of st..lth recording, I'd go with a smaller unit.
Finally, when recording in the Dual/Line mode, even with the limiter turned on, it seems to only work on the mic-in, not the line-in. I found this out on night one when I had the line-in from the soundboard too high and got nasty clipping. I still think nothing beats the Safety feature on Rockboxed Irivers and am baffled as to why nobody includes this on retail units.
I'm going to keep the DR-2D because the Dual/Line function is really nice for recording my band and the Dual Rec function (recording a backup file at a lower level) will also be handy for taping (although just having the Safety feature would render this need moot). I just ordered some new Eneloop batteries and will probably get the Tascam AC adapter for when I record my band.