As a matter of fact I have been taking a hard look at one of these, there's a lot of off road trails around here that would be perfect for that bike. Don't think I'd want to take a 5,000 mile road trip on one though.
I'd be going through all that on my way up, was going to take Labrador and Quebec for the return leg. It seems silly to return along the same route I would take going up, and why waste the opportunity to see the deep wilderness of Labrador when I'll be right there (one of my destinations is the Viking settlement in the very NE corner of NL, just a quick ferry ride to Labrador). If I don't take the TLH (Trans-Labrador Highway) I'll always regret not having tried it, but the little voice in my head tells me that it could be a very miserable experience and I'll come to regret it. I'm thinking the best solution is to head up there with a plan B route and give it a whirl, if the road is what I fear then turn back and take the alternate route home.