Well, I guess you're going to expect this crusty old duffer to start banging on about how 26" is the only real wheel, or how back in the day we used to ride everything on bone shakers with wheels the size of milk bottle tops;but to be honest having actually ridden a 29er I can safely say that little wheels are for kids bikes.
You wouldn't ride a BMX in the Tour de France and to be honest, as I'm not likely to be sesioning the slope-style courses of Whistler bike park any time soon, the added fire power of longer treads seems the only way forward if you like riding a bike off tarmac.
One razz around on Giant's finest demonstrated that this over-grown jey-boy bike was more capable, faster and more fun handling than my 130mm travel 26er full-sus. It rode like a road bike on flat stuff and descended like a motocross bike on the ruff...hmmmnnnn...
Shame I can't afford one