The first few seconds of the video of the watch over at Puretime shows a stutter on the second hand... Is that the known "stutter" on these Miyota movements? >>> http://www.replicawatchvideo.com/watch.php?vid=2dfdf5f09
Miyota 8015 has well known stutter. Pot luck if it's less obvious. So does the Valjoux 7750. Very difficult to fine tune. I have a gen 7750 with chrono function removed so has a constant running centre seconds with noticeable stutter.
Worst stutter I've ever seen was on a gen IWC ceramic Ingenieur. It was so bad I simply wouldn't have bought it just for that. Apparently it's a known fault with the gen movement. Didn't happen when IWC still used ETA movements.