I have used drsfosterandsmith.com (liveaquaria.com). The shipping was excellent and so sturdy that I still use the coolers today for transporting livestock. Everything was incredibly well packaged.
As far as the health of the specimens. Their corals always come in great shape and plenty big. Their fish are another story. I ordered three Anthia once, and two arrived dead, (almost).
So I just use them for corals now. ANd I use their "Diver's Den" area where everything is what you see is what you get. I get to pick the actual piece I want. It's a great way to buy. It costs a little more than a frag swap sure, but it's a bit cheaper than the LFS in my area and the size and quality of the corals can't be beat.
I'm sorry that doesn't answer your specific question regarding marinedepot's livestock.
Cheers
Josh