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This thread is a bit old, but I only just stumbled across it.
I own a DDM60Pro mount. Regarding the balance question... Yes, the mount must be very accurately balanced to get good performance. I use a system of sliding weights to get near perfect balance.
If there is a power cut (not happened yet!) then there would only be a problem if it happened during a fast slew. If it happens during tracking the residual friction in the bearings will keep it in a fixed position.
The issue of unguided imaging is vexatious. If your scope has ZERO flexure, in all planes, in every position, then it is certainly possible. Some people get 45 minute unguided images.
Even with a sturdy carbon fibre tube I can not achieve it and so guide.
Older DDM mounts did have to be calibrated at the start, but ASA now put absolute encoders in, and the mount knows where it is when switched on.
Some time later this year there will be Version 2 of the mount which promises to be even better (but probably a bit pricey!)
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