I had it done about 10 years ago. My prescription was - 4/-4.5 I think, and I'm virtually 20/20 now. And I've seen no change since the surgery. The best money I ever spent. It's probably payed for itself in contacts and lens solutions.
I do have questions about my night vision, as I've noticed that I can't see as well as other people in low light, but I didn't notice any change between before/after the surgery. It's just something I've noticed in the last couple of years, usually when riding with someone and trying to read street signs. So I may have always had bad night vision, or there may have been a slow, unnoticeable deterioration. Regardless, it's not something I feel is a hindrance.