I've just bought a (Mojoto size L, 260g) and the fit is amazing for my large round shaped head! The retention system provides a really secure and comfortable fit but as others have said the retention system will be problematic for many glasses. I have Rudy Project Genetyk glasses with slim ear pieces that tuck behid the ears well and don't cause a problem but i can't imagine how an Oakley Radar for example will work.
The Mojito helmets worn by the Sky team look to have an adapted/custom retention system to accomodate Oakleys and are not the same as the retail version. Certainly Cav's version i saw on the Sky Atlantic documentary on the Sky team called 'Road to Glory' showed a different (lighter weight?) retention system which was less intrusive round the back of the ears.
The look is definitely compact too not mushroom heads here.
Overall a great helmet if it works for your glasses.
Incdentally the Laser Genesis i tried was a quality lid too but didn't work for my head shape. Too tight on the temples and never felt secure like the Mojito. Maybe better for oval heads...
I also have a Bell Sweep R which fits great but sits so deep that it impacts on the top of my glasses. Good for the commute though.
Noticed that too about Cav's helmet. All the Sky guys wearing Oakley's and Kask's is something that bothered me for a while because I couldn't figure out how the glasses were fitting them correctly. Finally noticed that the retention parts seem to be better shaped for Oakley's like you said