Fit is EVERYTHING.
I have a Geigeresque long, narrow head and positively adore my new Lazer Helium, courtesy of the estimable Mr. Sean Brown at On the Rivet. The Rollsys adjustment system simply blows away everything else on the market, and I cross-shopped damn near every top-end lid that was available locally.
I was also impressed with the build quality and attention to detail of the MET lineup in particular, even more so than my Lazer or my girlfriend's Giro Ionos. Every other helmet brand on the market is made in China, not so with MET - and the MET's ventilated Kevlar-reinforced straps were also a really nice touch, compared with how a $400 Giro has the same damn straps as a $40 Giro. It really came down to the sheer awesomeness of the Lazer's Rollsys, and the MET Sine-Thesis not being available in PRO white.