We lease it for a fixed price per sq. ft. and the toner and paper are supplied as part of the lease. They come out and do PM on it regularily, too. The lease is lower than what we bill on it, plus non-billable stuff, so that was a no brainer. In the three years we've had it, it has only been down once for an extened period, the motherboard went out, and it took almost a week to get it back up. I just checked, and ours is exactly 24 inches from the wall, never noticed it before, could have something to do with how the paper comes out the back and down into the tray? Every once and a while the paper does get hung up going into the output bin and it's nice to be able to get behind it without having to move too much.
As far as ozone goes, all laser-type printers carry the warning, and I'm not aware of the KIP being any worse than others?