No TV. I've got a dell m4500 with also a dell monitor connected on the vga port. With which twinview now is automatically switched on.
There seems to be no noticable cpu hog. It just when switching between programs/tabs/... that there's a one second time lag. As though the screen image had been buffered somewhere and is being pulled back in.
I guess there's still work to do on nvidia integration.
But apart from this lag, I've got no complaints. It's clear a lot of effort was made - when seeing the difference with UP4.
Oh wait ! The progress dialog of DejaDup is totally black.