I never liked them cxp rims, always found them a pain to build. The halo rim is actually quite good, sold a few sets when I was in the trade.
The prices have gone a but mad on rims though, mavic seem worse than others, when I was looking for aero rims though I settled with velocity rims, I got them sent to me from brick lane bikes in London, the service was really good, also when I then visited the shop a few months later I got talking to the guys and they showed me their stockroom which included the velocity rims, must have been about 100 in there, all different finishes and colours and drillings, and I think they were only about 37 quid a rim maybe a little more but they built up nice and easy. They also sell another brand called H-plus Son, they seem to be popular, think they might be more money though