Had a 29er for a bit, sold it mainly cos my GF at the time was getting into riding and it was the one bike I had that she couldn’t fit on, and it got left on the shelf as a result.
Was an Inbred 29er, Alfine hub, 100mm Reba’s. Was very heavy (not just the frame, other bits I put on it too), but rode a lot lighter than its weight. If I got a 29er again, which I’d like to but funds won’t currently allow, I’d get a lightweight hardtail probably, with 100mm fork and a racy build. I reckon this approach best suits 29ers myself, a bike that’s both light and fast and can cover big distances comfortably and quickly. They can work as hardcore bikes of course, and the 29er wheels ability to roll over obstacles with more ease than a 26″ wheel is noticable, but when push comes to shove on more technical terrain, you can begin to notice the slight unwieldy-ness of the bigger wheels.