I've had LASIK and it was the best money I've ever spent. I was -6.5 and -7 (i.e. couldn't see anything without glasses) and my vision is now better than 20/20.
My advice would be don't go to the High Street guys - go somewhere specialised like Moorfields (which is where mine were done). Two reasons: specialist eye hospitals tend to have the most up to date equipment and therefore you are minimising your risk. Secondly, some High Street operators are trained solely in that particular method so if something goes wrong or you have other complications, they may not be the best people to help sort your issues out.
The other thing is, don't believe the prices you see on TV! Prices tend to increase the higher your prescription. Mine ended up being about £4k all in, which is definitely the more expensive side of things but I did my research and this was one of the few surgeons I wanted operating on me.
There is a brilliant (but long!) thread on a site called Pistonheads which has loads of advice from a couple of eye surgeons on LASIK, but I'm not allowed to post links on here yet as I haven't been a member long enough. PM if you're interested and I'll send you the link
Editted to add: the people who are mentioning the smell. It's not the smell of your eye/skin burning, it's the smell of the laser. And it really isn't that bad.
And to the person who said you have to redo your eyes every 10 years, that's just plain wrong. If you have your eyes done young enough (when they are stable), you can have years before your eyesight deteriorates. The point is that your eyesight will naturally deteriorate over time and laser eye surgery will not stop this happening - but your eyes certainly don't need "topping up" like Botox to keep seeing well! If your eyesight does start to go, this is because it naturally would have gotten worse at that point in your life anyway.