I've had 2 SMF conversions so far. First was on my PD130 Golf, was quieter than when I took it in for the work and would not chatter at all. Second was on my B7 A4 2.0 TDi, again using the same kit no noise at all and driveability was fantastic. I used Valeo conversion kits both times, the friction plate apparently has some kind of dampening to stop the gearbox chatter. Whatever it has, both of mine have been silent and fantastic and the kits were just over £300. I should mention, both of my cars were remapped and the conversion handled the extra torque without issue.