A friend of mine got his brand new Breitling Evolution yesterday. Bought it at a local AD. When he showed it to me. I immediately saw the jerky chrono second hand (trained eye ).
It bugged the crap out of him!
Went back to the AD, showed it to the salesperson. He said: wear it 24 hours with running chronograph, then see what it does. 24 hours later no improvement. I did some reading in The Zigmeister's articles and saw that this problem was caused by a bad tilting pinion (at least in the Asian 7750s).
Again went back to the AD and said there was no improvement what so ever. The second hand still jumps like a quartz. Now the Evolution is back on his way to the importer or Grenchen.. I don't know.
Damn is he dissapointed
Moral of the story: Asian 7750, ETA7750 or Caliber 13... all great movements but you need a little luck!