I have a blue tinted canopy on my 27. Love it. Also wear Zeiss sky tinted
glasses for the UV. Great.

Keeps things cool, improves definition of clouds, doesn't affect
visibility at dusk significantly. but then I am usually on the ground by
then.

Only problem I have noticed is that yellow things such as oil seed rape in
flower look like water! I always carry a spare pair of clear glasses in
case I need them.

Jim