I haven't had it done, but am in the process of scheduling laser resurfacing. I had large cysts all over my face back in my junior year of high school, and it has left me with terrible scar tissue. The dermatologist told me a few things:
1) You will not get flawless skin and you will still have scars from the dermabrasion. Don't expect to come out looking like an airbrushed GQ model.
2) You will have to wash your face 8-10 times a day to keep it moist and avoid infection.
3) Your skin can stay red for a year (or more) after the procedure. Make sure you're willing to deal with that before making your decision. It's always easier said than done, so don't say you can handle it if you know deep down you can't.
4) If you've had a recent treatment with Accutane or more than one treatment in the past, your skin becomes less likely to heal properly after any surgical procedure. Definitely something to take into account if you are using/have used Accutane.
Other than those things, it's an okay procedure. The being awake part freaks me out a little, but I'm tired of little kids in the Burger King line pointing and giggling to each other about my face whenever I go out without makeup on

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Good luck!