My everyday glasses have transitions lenses--I've been using transitions for several years now. As Eden said, they don't get as dark as actual sunglasses, so I don't use them for cycling. But for just everyday life, they're great. I walk around campus from my office to classes, library, etc., and it would just drive me nuts to have to be changing from clear glasses to sunglasses every time I entered or exited a building.

Xeney, the serious astigmatism is my problem, too. Sounds like there's a general feeling of satisfaction with the sunglasses-with-Rx-inserts, so I guess that's what I'll go with. And I'm told I can get them as bifocals, so I can read my computer (my regular glasses have progressive lenses--between the progressives and the transitions, it's a good thing I've got the vision plan with my health insurance! )