I was moderately satisfied with my experience from Divetank.com
My advice - if you get a suit and it doesn't fit, send it back immediately and start over with a different size. Don't accept an offer to have the suit altered so it fits you.
I ended up with a "customized" suit that I couldn't return, when I should have refused alterations and ordered a smaller size. When the altered suit arrived, it still didn't fit right, but was diveable.
I was initially satified with the result, but 8 months later I'm realizing the suit is still too big and I'm looking at getting rid of it.
This wasn't Divetank's fault... more my own for being impatient and settling for a less than ideal fit. Don't make the same mistake.
-Brandon.