I got PRK at Bethesda last September. AWESOME DECISION (if I may say so...).
The surgery itself wasn't too bad. A little unsettling, but not bad. Not sure how they work it for Coasties, but there's so many mids who go that it's basically an assembly line process.
The weekend following was less than fun, but could have easily been worse. PRK has a slower recovery than LASIK. Everyone recovers differently: I was off the percocet and numbing drops within 36 hours or so and up and about the next night. Some of my friends were rolling around in their racks, shielding themselves from the light like vampires, all weekend. Either way, all you'll want to do is sleep until it's time to take your pain drugs (and then immediately go back to sleep) for the first day or two.
My vision took a little while to settle, but I was at ~20/40 in both eyes by the one day check up and 20/20 in both eyes by the 3 month check up (from 20/60 and 20/200) and got cleared for pilot/NFO by precomms in the spring. There was at least one person in my class who was cleared for flight vision-wise BEFORE the surgery and PRK messed it up, but I think they were on the verge of being eligible for the surgery so it was a near thing anyway.
When you go down they tell you all these horror stories, but if you're a good candidate and take care of yourself after the surgery, it seems to have a very high success rate.