I have a pair of Optilab's prescription cycling glasses, though the actual make is actually Loubsol. I went for the reactive lenses. Pleased with them overall. The only minor niggles are that the frame is rather heavy looking. This has two effects, when it isn't bright enough for the reaction lenses to darken they do look rather grim. I can best describe it as a nerdy welding goggles effect.
The other thing is that when you are doing an over the shoulder check the thickness off the frame is a PITA, not enough to obstruct vision per se but very irritating.
The service from Optilabs was very good and from my POV being within cycling distance is a bonus. I'd buy them again unless I could find a pair with a lighter frame for the same price elsewhere, without resorting to inserts.