Use one(2.25 UST EVO) on the back of my Pace HT, with Nobby Nic up front, and imo theyre awesome. Id love to try front and rear, but at £50 odd a piece, its not happening anytime soon.
I left them on all winter last year, and no complaints. Obviously no match for trailrakers or anything like that, but for the speed/grip combo, i love them, and not dangerous in the wet like Race Kings.
I'm not getting on to well with the ones fitted to my Soul. Out again tonight, only the second time I've ridden with them, and while they were fine in the drier bits (but so would pretty much anything else) they were all over the place in the damp or muddy bits. Ok most that is me being crap but I rode some of the same terrain last night in muddier conditions on my Epic with Larssen TT's and they seemed much, much better.