Been wanting to go since I was 16, I'm now 39 and finally went this year. Surpassed expectations. Cried at least 4 times with delight. Sound quality was one of the things which pleasantly surprised me, as was how generally nice people were. Sure, drugs help with that, but I saw little to no aggro throughout the weekend, which shows that, generally, people are nice!
I'd done a fairly good job of learning the map, so was fairly efficient and only had a few minor regrets in terms of stuff I missed (I sort of expected to miss a lot more than I did). I did a fair bit of exploring, but forgot to try pushing/going into random bits of wall/doors, especially around Shangri-La. Tried to meet up with perhaps too many disparate groups of friends which was nice, but to be fair I can see them any time. Couldn't have asked for more weather wise, and to be honest I'm considering never going again as I wouldn't want to sully what was basically a perfect experience.
That said I've picked up a nasty cold which isn't helping with the comedown