500 (570) vs. 650

I realize the 570 isn’t out yet, but I was leaning toward that machine for my next puchase, and was wondering how the 650 compared in power deliver. I realize the 650 has more power, and the current 500 also has a good horsepower total. However, the 500 gets criticized for being tuned for top end, and that it feels soft on the bottom. What about the 650? How does it "feel?" I had one dealer tell me that it was very strong on the bottom and difficult to handle in technical terrain, while another dealer told me the opposite. I believe the 570 will be more than enough for my needs, but….in case there happens to be a ’15 650 on the lot when the ’16s come to town, I want to know what I’m passing up if I ignore a screaming deal.

Thank you!