I have a 702 and have had no complaints - not even related to heat. I do have a good amount of breathing room for it in my rack, but that was just the result of the spacing available. I've never touched it while pushing it and noticed any particular heat issues, though.

---- A Woofer in Tweeter's Clothing... M60s, VP150, QS8s, EP350 Onkyo TX-SR702, Denon DVD-3910