I've come to hate HDC with a passion, at least in low range offroading. If you let up on the gas it assumes you want to slow down, and actually brakes. Very non-intuitive for me, there may be times that I want to let up and simply do some engine braking. I've found that no HDC, lo range, rock crawl mode, and left-foot braking give me all the control I need.
In the event that I try to brake too much on a traction-marginal surfface, the ABS and traction systems are pretty amazing on this vehicle and rarely seem to induce problems on their own. But, throwing HDC in the mix and having the vehicle try to maintain a speed while also control wheelspin/locking/sliding seems to be a bit much for it.
This all being said, I haven't had to do any snow/ice yet, just mud, sand, and gravel. But, I'm really impressed with the ABS and DSC systems, I think those combined with decent tires, careful driving, and judicious use of command shift and low range when needed will be fine. In short, HDC really just seems to be a gimmick to me.