Thought id throw in my 2 cents.
Did a manual swap on my 335d and decided to use the uniclutch track with a smf. Can confirm it chatters, loud enough to hear it through the centre console. Have to raise the idle rpm to 850 to quiet it down a bit. Sounds like a semi truck at low rpm.
I think it will be quieter with a n54 but i dont think it will get rid of it completely.
Awesome feedback
Would definitely be quieter with a N54. As an owner of both M57 and N54 engines the M57 is definitely orders of magnitude worse in terms of chop chop chop.