They're great for SS – the way they roll over stuff suits not having any gears, as it means you don't have to brake as much on the downs, so you keep momentum better.
As for geared ones, watch this space and the results at the Thetford Winter Series ;). I know the frame handles really well, but not sure about how well it goes at race speeds – guess we'll fimd out next weekend! Also not sure about the gears either – I may change to 40/26 double, as I have a 44/29 and a 12/34 on the 26" bike and love it, just want to test out the "bigringability" of the triple first. I usually use 44/3rd largest cog on cassette and harder gears on the 26" bike round Thetters, so I'm wondering will this mean I'll be on 44/2nd largest? Anyone got any experience with geared 29ers? I've fitted a 12/34 cassette, same as I use with the double on the 26er.