These look to be a great idea and might eliminate the need to carry two visors when on a trip (even though changing them out on my RF1100 is quick and easy).
Exactly. Plus you can even pop it down or up WHILE RIDING. For example, when going into a tunnel, or suddenly heading into the sun. And it rarely needs cleaning, so you only have to "maintain" one shield. Also, you don't have to remember to carry another.
Plus- when riding slowly or at a light, etc, you can open the main clear shield while still leaving the tinted one down!
I'm not sure how well they'll work with glasses. Can anyone comment?
Should work OK. I don't find there to be a clearance issue on mine. I don't wear glasses while riding, but there looks to be enough space.
Does having a hollow space in the crown of the helmet (where the retracted visor resides), and the accompanying mechanisms, have any adverse effect on the helmets ability to protect you in a crash?
I don't believe so. I have the Scorpion EXO-1000 and it is SNELL 2005 rated. That would be REALLY hard to get on an unsafe helmet design. SNELL is extremely strict.
I have three issues with the EXO-1000's sun visor feature. Would be interesting to hear from those with other manufacturers' implementations to see if they have similar experiences-
1) They include a lightly tinted one which is useless. So I immediately had to replace it with a dark tint. It is nice that you CAN replace them and that darker ones are made, but it is an extra expense (probably part of their plan) and they can be a BI*** to physically replace.
2) The sun visor doesn't extend down quite far enough for me. It needs to be about another 1cm longer (further down) for best coverage. Plus the nose cutout is just silly- nobody's nose is that long!
3) The mechanism is a bit hard to operate and sometimes it is hard to get it to go up all the way up.