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@AlexB
I use Optilabs photochromic as well. I've had them for about 4 years. They are excellent. totally clear at night, go very dark in bright sunlight.
However, get the grey lens, not the brown one. The brown lenses are high contrast - you do NOT want high contrast lenses in low light or shaded conditions.
Why not?
High contrast means that shadows are made darker. Great for snowboarding. Shit for leafy lanes and shadowed streets.
Low contrast lenses mean that the overal light levels are reduced when it's bright, but your ability to spot potholes and manhole covers in shadowed streets is not impaired.
Grey lenses also do not mess up your colour perception.
Brown lenses enhance red - great for spotting brake lights (this is why they usually supply "driving" glasses with a brown lens), but generally mess with your ability to distinguish between objects with similar colours under poor light conditions.
As an ex-mountain biker I can confidently tell you that grey lenses work much better for road and off-road conditions and across a wider range of light levels.
Finally, although it doesn't say so on their website, Optilabs can glaze many brands of standard sports sunglasses, for example Tifosi models with the DirectFit system. Their price for this, quoted recently was £97 for photochromatic ,hard-coated and anti-reflective, single vision lenses.
A pretty stunning deal I would say.
http://www.tifosioptics.com/rx/index.html