No, i've never used them but would like to. They're just your typical db's bro. Just a lot of weight attached to them. And it's all plates if that's what you're asking. But there's guys that use them though. It's really not that much weight if you think about it. Hell, i'm almost there right now. But on the otherhand, if i was pressing 200lb db's i'd be a bad boy. haha...
I'll send you a link to my gym tomorrow. It's on myspace and i don't remember it right now.