Scm - I have left it on since I first plugged in. Will run it for a couple of more days while I'm out of town & see if it makes a difference. I continue to be impressed by the depth and imaging - especially between the speakers, which can be a bit difficult at times to dial in on the Ohms.
Mapman - This is the first Class D amp I've had in my system, and it is an enlightening experience. I had previously run it with an Anthem 225 integrated (a very underrated amp), an Unico Secondo hybrid, and Parasound separates, all of which had their virtues...but there's a finesse and musicality to this combo (the 470 with upgraded caps fronted by an Eastern Electric Minimax) that I'm not sure I ever heard from previous iterations of my rig. I've only listened at low- to moderate volumes so far (my neighbors have been home, so I've not really opened things up), but I'm more than intrigued. Another great feature of the 470s is the adjustable gain pots on the back...the EE MM has a ton of gain, so the ability to dial back is a bit of a godsend...