I just installed a set of Rox 2" risers (gen 2), I would say by design they have a greater range of adjustment than Motowerk, and they are of similar quality and finish IMO. The clamp design is more like traditional bar clamps, so I now have about 5" of unobstructed 7/8" handlebar to mount other goodies on. Awesome ergos for my short arms, standing on the pegs doesn't require hunching over.
The big V has a simpler style of bar clamp ideally suited to the Rox (it seems), and likely other brands. Motowerk doesn't appear to make an anti-vibe for the 1000, at least not after checking their site just now.