They're great (by that i mean damn well better than koxx rims...) they hold grinds for aaaages (then again, compared to koxx rims but whatever) 21 grinds so far and only 4 dents in the rim (which have been fixed with an adjustable spanner). Ooh and also there's a lot of braking area so setting up brakes is a bit easier and flatspots (little ones anyway..) don't make any difference to the braking, aaaand they're pretty light! Get one.
Edit: there is a downside though, they're a bit thin (38 mm or summat) so I had to push the maggy calipers right in which resulted in the rear brake being a right biatch to set up, but yeah that's with a pitbull (supidly wide frame) but I see you have T-rex which is basically the same...