I've had glasses since I was 3... I really can't say anything about them besides how much I love featherlights. Lens thickness has so drastically reduced in the 18 years that I've had glasses.
I'm legally blind without them (although since I'm far sighted, it's not like I'm dangerous behind the wheel). I actually went without them for maybe 8 years, because the eye exam I had right before I got my license when I was 16 was so much better than it ever had been, but the eye exam the week before I turned 21 (I thought that with my vision history, it would be a good idea to go to the opthamologist before I showed up at the DMV) showed that all of that wonderful improvement in my vision was temporary.
I don't wear contacts because it's just too much of a hassle for me. With my prescription and astigmatism, there are only two manufacturers who even make contacts for me. One of them causes this sort of ghosting effect, where there are patches of foggy light at the edge of my vision (seriously obnoxious), and the other kind dry my eyes out really badly. I have some seriously stylin' glasses, though, so I'm cool with it. I'd probably go for contacts if my lenses weren't thin enough to fit into metal frames, though. I used to have plastic frames, because my lenses looked so rediculous in metal, but my nose is crooked, so they looked really dumb.