A big advantage of the Mitros+ over the Canon radio flash system is that you can still combine your older flash units like the Canon 580EX II by attaching those to an Odin receiver. And pre 20102 camera bodys still have full group control as well.
Also, unlike the Canon system, the Mitros + and Odin provide reliable receiver options to fire manual studio strobes etc as well (and from just $50 for the Strato II receivers).
A range of Phottix products including the Mitros, Mitros+, and Odin for Canon, Nikon and Sony, are also now available from B&H Photo for the first time.
Phottix have really set themselves apart as the premium Chinese manufacturer. The Odin has proven itself as one of the most stable and reliable TTL triggers available, and you only have to hold a Mitros+ to feel the difference in quality. They also come with a full 2 year factory warranty.
Mitros + for Nikon coming.