I have a set of MTRs on my Rubicon(stock) and a set on my 8600 gvw pick up truck (not stock) basically 31's. There's 8k miles on the Jeep(since 3/04) and about 20k on the truck. I run 33 psi in the Jeep on the street, and I run 45 front and 65 rear in the truck
They are mud type tires with large lugs so you can hear them- I dont think they are any louder than any other tire Ive run, truthfully I dont hear them in my truck(sealed cab windows up). I can FEEL them though, at slow speeds you can feel each lug hit the pavement, through the steering wheel, not so much the seats.
In the Jeep I can hear them, it varies with speeds, but they do hum a bit. For what they are I dont mind the noise, and really the noise isnt that great. Ive run beside cheap or not maintained passenger car tires that are louder than the MTRs.
the big thing with lug type tires is to maintain them correctly- check air pressure often, run them at the correct pressures(NOT the sidewall pressures), rotate them, and keep the vehicle in alignment.
On and off road they do fine- great on the rocks, decent in the mud, excellent in deep snow, OK to good on Ice, excellent in the rain, excellent on pavement. The tire comes in may configurations and various load ranges so some may ride and handle differently with various vehicles and rims etc.
My next set of tires will be the MTRs - 285's for my Jeep