Following up on Mike F's comments
I had a 372XP. Never liked it. It was too much of a tweener. If I needed power I had the PS7900 at the same weight, if I was bucking 16 inch and under wood, I used the 357XP.
For felling hardwood logs the 372XP doesn't have the power band for giddy-up and go when you really need to adjust your cut in a hurry. Lost a couple nice veneer grade cherry trees that way and stopped using it for felling, logs anyway. (The buyer tends to get really, really testy when you turn veneer into firewood.) If you're just cutting firewood tops, the 372 XP will do, but the 576XP will do it too and if you set it up with an 8 pin and 20 inch bar a stock 372XP isn't going to hang with the 576XP in larger wood or especially noodling big chunks. If you do want to go to a longer bar from time to time changing the sprocket when you swap bars takes about an extra 2 minutes total, if that.
The 372 XP does have an outstanding rep for reliability. So far and I don't have a huge amount of time on mine, the 576XP has been rock solid.
I haven't tried 576XP with a longer than 20 inch bar, as stated that's what the 7900 is for. The 576XP though it looks big, handles surprising small, weight wise I really don't find it objectionable. Of course when I'm cutting wood I tend to to think about the job at hand and not some marketing spec sheet info. I'm strongly considering trading my current 576XP in and getting the heated handle version to be my all around, all year saw.
As far as anti-vibe, there's none better than the 576XP that I have tried. I did get to try a new 372 X-Torq courtesy of Spike60 at a GTG and it was smooth. In terms of overall power etc.. I can't comment as 3 or 4, 15 inch cookies hardly makes me an expert. I do have a friend up in Maine that cuts pulp however and he and his crew are running 372 X-Torq saws and are really pleased with them.
Well Mike opened the door. I walked in. take my comments for what you think they're worth, and be sure to make up your own mind. Buying anything because somebody else says you should and then not being happy gets expensive in a hurry.
As I have no experience with the AutoTune option I can't make any comment one way or the other.
Take Care