I have mine for almost two months now, and it's more or less my daily beater. Very precise (haven't done any testing, but it may loose 1 minute in 7-14 days), excellent quality. I'm careful with A7750, but it's OK so far. I haven't tried if it's waterproof, except for washing hands but I plan to take it to watchsmith to check all gaskets and seals, so I'm not taking any risks. As for power reserve, it's very good (I'm not an expert really, since it's my first auto movement), it is definitely between 36 and 48 hrs - again I haven't tested it, but sometimes I don't wear it for two days and I find it still ticking. I ordered SS bracelet additionally and it's much better than rubber - at least for me. Rubber band does not fit small wrists like mine, because it can't really band in first cm on watch side, so it looks kind of wrong - maybe on bigger wrist it will fit better - you can see it in this pic:
Only problem I have is wrong date font - not a bit wrong like other guys point, but completely and terribly wrong:
I'm currently trying to find swiss 7750 on ebay to swap it together with datewheel because it seems stock ETA datewheels are really hard to find - at least for me
The other thing that is different from the gen is movement decoration - in gen some bridges (I think these things are called bridges ) on the movement are decorated, on A7750 they are all flat (thay are also flat on most swiss 7750).
I don't have any pics with SS bracelet so far, but I'll try to take some and post them here.
bye