Thanks TU.
I used the chains last night for the first time, and it was pretty fun.
Funny thing happened though. We are in the process of joining a new gym...we've been at our old gym for a few years now, and it's getting run down and gross, and the new manager is a cranky bitch. It's always pretty empty in there, though, and they usually leave us alone and let us do whatever we want.
We were weary of bringing the chains into the new gym, so we actually decided not to bother and went over to the old gym. They stopped us on the way in the door, and the bitchy manager was like "NO way. I don't want you starting this stuff here because then everyone is going to start doing it. I don't want to start something like this."

So we left and went over to the new gym...they were like "Sure, no problem."
The chains weigh 80 pounds. I did:
-2 sets x 3 with 95 pounds on the bar
-3 sets x 3 with 115 pounds on the bar
We set the chains up so that all of the weight was off the ground at the top end, but they are on the longer side, so all of the weight was not on the ground at the bottom end. These are borrowed chains...we have to cut and set up mine from the long piece of chain I got for Christmas. When I do, I think I need to make the chains shorter and hang them closer to the ground, if that makes any sense.
It was pretty cool, I like working with them. I did the sets without a spot, but I was definitely wobbly...the bar was moving back and forth a bit.
I also did 4 sets of relatively light bicep curls and an ab workout.