We had a metal roof installed about 5 years ago. Love it.
It was an easy decision for us as we would have needed to strip the entire roof, plywood and all (50 year old 2x2 sheeting that had sagged) and that was a $12k job at the time. With the metal roof there was no need to strip the plywood and the cost of the metal roof was only $18k. Unless it's a torrential rain we don't hear it and basically of it's raining hard enough to hear it on the metal roof you would hear it on asphalt. We also redid our eavestrough and downspout at the same time and went with steel as opposed to the aluminum, big difference, you'd break your fist before denting it, unlike aluminum.
Given you probably get just as much snow as we do, if not more, make sure that they install snow guards all the way around. Without them when it decides to let go it comes down with a vengeance and will destroy anything in it's path. We went the first winter and only had them installed where people would be walking, after the first winter we have to roofers back and installed them all round.