Touch wood, so far all my 7750s (none of them serviced) have not had any issues at all over the last 3 years. I think they are a great movement, and since you never really know what you are getting when you order 'Swiss' movements from our dealers I think the Asian version is great value and a good work horse.
Sounds like a loo
se rotor, very common issue. Just open the case back to check. It could be as simple as tightening it with a screwdriver (gently) until it is in place and able to wind the movement.
It is the V1 with a white number on black datewheel. The lupe needs to be square and the crowns need to be bigger. Among other things... Can't wait to get mine once the V8 is out.
The first batches of 5004 Big Pilots had very thin and narrow hands from the older model. The updated hands refers to the newer version where they fitted more accurate thicker minutes and hour hands.