Never used or built these rims, but their range is very similar in price to mavic's. Personally i'd stick to what i know, and i know mavics are very good. But then maybe it's nice to have something that everyone else doesn't?!
I'd also rate DT's rims very highly, having built a bunch of these i've never had a problem with them. Plus their deep section 1.2 rim is the same profile and size as a deep v, but is made so much better!