For those that want the Girodisc...try getting it through UUC with a 15% off sale. Although the ad says otherwise it will apply the discount.
The girodisc tool is just too damned big for the occasional use at the track. I already carry enough crap. If there's any situation where I'll be in a time pinch and want to spread the pads and pistons quickly...it would be at the track.
So I think this tool is the perfect HPDE companion.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red