Just got mine out of the shop for this issue. They filed a PUMA case, BMW opted to replace my clutch instead of the entire transmission. Shifts are still notchier than I would like when cold but its waaaay better than it was. My main issue was the 2-3 shift I could feel metal on metal contact when shifting (no audible grind noise). I've driven enough MT cars over the years to know something wasn't right. My 135i shifted smoother.
Either way I had hoped they'd just replace the whole thing but the clutch replacement did enough that I'm not going to complain anymore. 25k miles on the clock with 3 months of warranty left.