If you're in Boston, check out independent Fabrication, I have 2 indies and I love them.
I got my first 1 custom because I am a not very tall woman and I was looking for a good solid tri bike. I wasn't impressed with things I was seeing off the rack (this was 5 years ago, things have changed a bit) I figured with what I would be spending for off the rack and getting it to fit me, I would go custom.
I love my bike.
LOVE LOVE LOVE.
I've done 3 ironmans on it and could not have been more comfortable on a bike.
It was a great experience buying the bike, it fits me like a glove.