I always ask my dealer to ensure that the hack, date-set, and time-set are all functional as a step in my QA notes. For some reason when I started getting into reps and ordering, I felt like I was asking for too much in my QA notes, so I would only ask for basic front, back, side pics of the watch. Then after I started combing the forums, I started noticing that (rarely) it seems some run into movement problems, and started asking for a lot of QA in addition to the basic pics. If the dealer is trusted across all of our hobbies forums, then 99% of the time (IME) you'll get a good watch with good movement IF you get very specific in your notes. I'll even casually mention that I'm a member of rep forums and let them know that I'll do a nice review on the sites after receiving their product. Everything helps! Heck, $200+ for a asian clone ETA movement rep really isn't cheap if it's DOA.
The crown stripping (as you know!) on UPO's is a known issue, and there are tutorials on the r&r with a gen. I JUST received my UPO from Marvelous Rep and I'm very satisfied, but I know I'll have to treat the crown with kid-gloves to avoid the striping issue. As far as the movement goes, many chose to locate a Swiss ETA and replace their Asian ETAs with them. It's cheaper than a new rep, and if you're lucky, cheaper than a few return shipping costs back to your dealer. Regardless, I would let your dealer know about the problem and see what he/she says.