Long epic rides with ht maybe a bit hard. I don't know. I mean, I've lasted long standing, but I'm not sure if I could stand 210 miles of standing. Nope. Err I say the dually. And maelstrom, what'd you mean duallies are fragile by any means? you mean aren't fragile, I think.
Anyways, subhuman, you obviously don't stand too much. I went through one of the don trails on my hardtail (stiff as hell) and I was just ripping through (small crashes, meh, part of riding) no aches. Ht riding was fun as hell. Although I must say, I like the crisp back end feeling of hardtails.