I too went Decision at Midnight and got in EA from a T4 where I had a 3.93 first semester, which put me in the top 3%. OCI went well, summering at a V50. I got minimal resistance regarding the transfer, and only from one or two employers. The seat deposit was due ~2 weeks after I got the letter, and was something like $500.
To answer some of the other questions that have been posed:
a) My second semester grades slipped a little, probably due to a drop in motivation since I knew my GPA was going away.
b) The school is big, and there are a lot of transfers, so it's easy to fit in.
c) I was a little apprehensive about losing my GPA, but I knew the end result was going to be well worth it.
d) I gave up some scholarship money (~25-30% of tuition), but again, I knew the payoff in the end would more than make up the difference.
e) Overall I'm incredibly happy with the decision to transfer. I love the school (though I don't care much for DC). The opportunities, both curriculum and career, are far and away better than at my old school.
I too got a lot of help from this board and the Yahoo group when I was going through the process, and I'm happy to "give back" by answering any questions.