I had an SMFW from PTB (similiar like Mfactory and all the other offerings). The rattle in neutral with depressed clutch was really loud, although i raised the idle.
I then tried the upgrade DMFW- but it didnt work and broke.
Now i have a custom SMFW with Twin Disc Clutch Organic and what should i say? The rattle in neutral is almost 100% gone- i have no idea why, but i think it is because the clutch was balanced along with the flywheel.
The Clutch keeps up quite well atm (didnt really pushed it that hard, since i installed it just before season ending) and the take off and driving is an absolute dream.
I had 5 clutches in my car, two OEM DMFW, one SMFW, one upgraded DMFW and i can say this Option is by far the nicest!