At the actual release event (Friday night), I did pretty badly. Though I did beat two of my four opponents, both of them were very new players and got significantly screwed in both games of their respective rounds. I just didn't build my deck correctly. The most memorable moment was a big mistake I made in the first round.
I was on the ropes late into the first game, thanks to my opponent's 2nd turn Dolmen Gate.

Thankfully, I had some evasion in Blue, and after bouncing her just-played Vigor out of the way with Whirlpool Whelm, I would be able to rush in for just enough to win if I got lucky with the clash on my Fistful of Force.
At end of turn, I won the clash with the Whelm. She put the land she revealed back on top. I decided to put Vigor on top of her library instead of into her hand, and completely destroyed my own "clash to win" master plan.

I lost the next turn, and then the round ended up being a tie.
Luckily, some of the guys there talked the owner into putting on a $10 draft for no prizes the next morning (Saturday), and I decided to get in on it. I sat down at the table with the following plan: Merfolk are pretty crappy, meaning no one will be taking them, meaning I'm going to get me some Merfolk. It worked out so well that I was able to build an extremely consistent 60-card U/W deck that absolutely crushed my first two opponents before losing to a blisteringly fast G/R beatdown in the last round (it still took him a long time to finally break me). Super Bonus: I cracked a Thoughtseize in the second pack that I was able to trade for nice things later, and the Summon the School that I passed up to take it came right back around the table to me.
