I thought it was confusing at first but it is pretty simple when you find out how it works. Once you figure out how to buy BTCs you just go to withdraw and type in the address where you want to send them.
As far as I'm concerned, it's only worthwhile for domestic orders of either quasi-legal RC's or certain less common drugs that dogs aren't commonly trained to sniff for, like DMT. I had a decent experience with one seller on the single order I made. It was a decent price for something that I've been wanting to try for a long time and have never seen available around here. Also, some of the RC's from known good sellers on there are at least worth it for me. One in particular was selling for about $70 a g less than I'd seen it offered anywhere else. There's also a lot of stuff that's overpriced. Really, that site is just like dealing with regular dealers. Some people are trying to rip you off, some will treat you well, and some might get you arrested. You have to make the call about who's who. Personally, I'd only order domestic from sellers with a fair amount of positive feedback, but not someone who sells a ton. Then again, there's only three or four things I would actually buy off there, none of which are much of a detection risk unless the vendor screws up.