I was wondering about MET as well, but they do not appear to have an active US distributor, even though the coverage of their release of the new MIPS helmets does quote a US MSRP.
If you’re searching for an aero road helmet, then I think that the Specialized Evade works the best for a wide range of riders. I know Josh Poertner has mentioned on his podcast that that’s what he saw in wind tunnel testing. It fits similarly to Giro. Unfortunately, when I tried one on, the sides of the helmet were pressing uncomfortably on my temples. I went with a Bell Z20 aero instead.
I do fit Giro all right, but the Vanquish seems to be more aero with the visor on, and I’m not really interested in a visor.