I ordered the Vemar Eclipse in size medium as suggested. The fit is pretty good, probably the best fit I have experienced. Certainly better than the Arai Signet/e, most likely due to the fact that the Arai Signet is not the shape helmet for my head. Long oval, mid-oval,round, etc, what do I know? Medium Arai vs medium Vemar, the Vemar seems 1/2 size smaller, which is good for me because the Arai was just a tad loose.
Anyway, I would rate the Vemar much the same as the previous posters did. The finish quality is slightly behind the Arai, but still very good. With the visor up there is some whistling at medium speed, above 50 mph it has some noise. More than the Arai? probably, the Arai has a more "full" liner and this probably blocks a lot of noise. With the visor closed it is eerily quiet. Ventilation is excellent, far more air flow than I am used to. I think I like better venting than the extra quietness, I can wear earplugs.
The way the Vemar fits my head is a new experience for me, and again is certainly due to the helmet shape fitting my head. The "grip" if you will of the helmet is pretty much equal around my forehead, back of the head, cheekbones, etc. The helmet does not move around at speed on a naked bike.
Thanks to the folks at Motowheels for taking the time to answer my questions. As always, good people to do business with.