While I can't compare them to the Hiedenaus as I've yet to try them, but I'm using the Mitas E07 Darkars and really like them. So far no complaints. I went with the stock size. I ride 50/50...
On pavement I've only heard a little whine on deceleration, but not all the time I think it may also be road surface. Otherwise the tires are quiet, good traction in the dry (I've not ridden in the rain on them). In the dirt, they have really good traction on hardback, and mild gravel. Seem to work well in buried and loose rock.
There is definitely a different feel to them compare to the stock tires, but not in a bad way… Just different...