I may well ask you for information, once I have mine. I particularly want an MC21, as the double sided arm is lighter than the pro-arm and they're easier to de-restrict, but aside from that I don't know a lot about them - yet.
I'm in the process of rebuilding a TDR250, or rather - modernising completely. There's a thread here about it. Once it's done in perhaps spring, it should be something special. Then it'll be the MC21's turn to have lots of fettling... not sure about tuning yet though. It will be tempting of course...
Will keep you posted.
Euro RC51 SP2: HRC WSB Ti Hi-Level, T1 Airbox & Snorkel, PCIII, Dymag CA5 Carbon Wheels, Ti64 Spindles (F, R & Swing Arm), Mori Link, Maxton GP7 Shock & Ohlins 832 Forks, Brembo GP Calipers & SBK narrow track (F), Braketech Disc (R), Brembo billet Underslung x 2 Brembo RCS, Tyga Triple, 7075 Stem, Probolt Titanium all over, Babyface rearsets, MR Complete Carbon Lineup, Custom Undertail & CBR 1000 LED, Watsen LED Indicators, Harris Brace, Giles clip-ons, Corbin seat, etc. 2013 BOTY.