Took mine out for the first time (twice) this weekend.
First night, didn't engage the -20dB Mic Attenuator, and ended up with too much brickwalling.
A couple of helpful members of this board pointed me towards the likely problem.
Second night, engaged the -20dB for the first time and the recording is outstanding.
Just a few observations:
Battery meter. Using rechargeable LaCrosse (charged with the LaCrosse charger). The meter went down to half-level within a short period of time (maybe 1/2 hour), but stayed at half for the rest of the recording, and was still at half after a 2-hour recording (including phantom powering the dpa's).
Level Meters. Certainly easy to read, but seem to be a little static in their response. I would prefer a little more reaction. Took a look at the wav files in Soundforge and the levels are not even close to as flatlined as the meter indicated.
Overall, though, this is a really easy deck to use. After having spent 1 1/2 years with the Microtrack, including a couple of months in the early days puzzling over its features, the 660 is much more intuitive piece of equipment.