I have an XD, best helmet i've ever owned. A second close would be the Quantum2. Fit and finish are superb.
Thrumming from the peak (solved with a 1 oz wheel weight attached underneith), and noisy (redesigns changed the vents shape and positions to reduce the noise level).
I'd like to try a new XD3 and see how it fares, but it is still an expensive helmet.
I tried on a couple of the knock offs of the XD but they all felt like my crappy Fox dirt bike helmet.