Oh, man. That's a cool piece of gear I'd love to pick up (but definitely can't right now).
If you don't mind me asking: why are ya' selling?
Sure, man, np - sort of a combo reason. Just built a new room recently and during the move I rethought what I had on the mix chain. With the CAPI SumBus being centerstage, I tried pulling the SB which was right after it and found I liked it better without it in the chain. There are other people who love it though, so it's not an issue, just what I'm hearing lately.
I don't take advantage of any of the SB's workflow (which is awesome) and I've got a couple of other units I'm considering to add to my setup from Retro Instruments. Have their 176 and it's incredible. I could use another.