That is a pretty cool side benefit. I get the same results on charcoal for steaks, with a hot side and cold side, bringing the steaks up to 120 or so slowly then flash-sear them on the hot side to get them to temp. Perfect char on the outside, done the same all the way through. I have always been interested in sous vide though and am interested to hear more about your experiences. The great thing is you can leave it at that set temp for a long time and it won't overcook the food. Pretty cool stuff.
The really nice thing about the sous vide steak was that the sear and overcooked meat was about 0.5mm around the edges and everything else was perfectly medium rare. If there's a thin part and a thick part they are cooked exactly the same. I've generally been happy with steaks however I cook them but I really like thick pork chops and I'm looking forward to cooking some this way. I've been butterflying them in order to get the center cooked but I'd prefer not to.
Then there's big stuff like the boston butt. Guess I'll see how it does with that.
And then of course, it also makes beer