B_R, I've only skied them in the "forward" position, and they rock-n-roll there. Try it when you can; I think they're a gas.
AZ777, welcome to EpicSki! Yes, I've skied them pretty much everywhere on the mountains out here in Colorado and up at Big Sky, too. I've had them in up to a foot of fresh, cut-up post-storm, fluffy bumps, icy bumps, trail's edge, crud, dust-on-crust, hardpack, groomed (everything from 8" of powder groomed to early morning groomed ice corduroy), trees, steeps, etc. So far, I have found exactly no conditions in which they don't excel. These are undoubtedly the best all-around skis I have ever skied. I was on them both yesterday (6" of new with snow falling all day) and today (day-old snow, groomers, bumps) at Copper. I can lay 'em out and carve glorious arcs in the snow, even pretty consistently carve a 360 degree arc. I have had more people comment positively on my skiing than ever before in my life (it must be the skis!), and I can rip on them, too, passing pretty much everyone on any kind of terrain, even when I am working at completing my turns well.
Today, in bumps, I gave demos to the group of level 7-8 skiers that I was guiding while giving them a few pointers for handling bumps. I carved turns through the bumps by simply tipping back and forth to snake some great arcs. I used typical re-centering moves on the crests, skied zipperline, blew up the fresh clumps, and turned multiple times on bumps. I used every technique I could think of while skiing the bumps, and the b5s answered every time. Again, those watching the demos and the free skiing runs made very complimentary comments, FWIW.
Some have told me that they think the tail is a bit too stiff for bumps. For some folks, that may be, but I have always preferred to get a "kick" from the tails of skis, so I don't notice this. The tails seem to me to follow the tips in the arc, and, unless I get off-balance back, they are very well-behaved.
The more I ski this ski, the more I like it.