Duratrac's are a great tyre.
I've had a set of 255/55/19 on my D3 for 16 months and 20k now. A mate has them on his D3 and between us, we have driven on pretty much every off road surface Scotland can offer.
They find good grip in snow and icy conditions, they are M+S rated and mine have the snowflake symbol on the tread blocks. I've never really had any issues with braking or steering in these conditons, you are aware the D3 is a heavy car so i left suitable braking distances between cars and was early on brakes to junctions etc.
Sand is no issue for them, my mate launches his boat off a beach and simply reverses the D3 down the sand to the water and drives out with no fuss.
They are good in muddy conditions and have self cleaning treads to a point, i have managed to clog them and get stuck in mud before but no tyre is perfect.
They found better grip than GG AT tyres in the same size pattern so i was pleased.
They do however, have rather weak side walls so if you do loads of rock crawling in places with sharp points, i would take care.
On the road they are MUCH quieter than the old MTR tyre, said mate tore the sidewall on his and used my MTR spare to get him home. You could hear the MTR over the others very clearly.
I've found the general road manners to be very good, turn in is crisp and i can still throw the car about with plenty of commitment to corners without fear of understeer.
Standing water is no issue with the tread design, Scotland does get it's fair share of rain and the local motorways have sections which are really bad for standing water and the D3 takes them in it's stride.
I can get a set of 4 fitted for £780, which at todays exchange rate of 1.70 makes it $1322.80
Not sure if that's good, average or bad for US tyre prices.
I will be needing another set by the end of July/Aug time and will be fitting another set to the car.
I would give them a 8/10 and would recommend them as a good all rounder tyre for both on road driving and off road use.
