I recently put RideOn in all my tires, both 50/50 and dirt - works great. Really smoothed out the road vibe on my 690, the 990 is smooth as silk, and I get some puncture/blowout protection to boot.
(But if you never ride at speed on slab, why bother)
Warped by the rain, driven by the snow
I'm drunk and dirty, but don't ya' know I'm still