I’ve had ccdb air & coil, Bos vip’r, all manner of fox & rockshox. I found ccdb air to be dead feeling, fox unreliable, rockshox dead and overdamped, Bos fantastic. The shock worked flawlessly until I accidentally knocked the air valve off & Bos didn’t want to know. Surf sales, however, sorted it in about 3 days and it was as good as new. That said, Bos’ lack of interest put me off the brand so I got rid.
i currently have an avalanche tuned rp23 which is on par with the Bos and a bit better than the rest. Avalanche remove the boost valve and replace this with a shim stack, which works a treat. I recently sent it to loco for a service and was told by Simon that he could do a very similar tune/conversion to the Avalanche; if I was buying a new shock I’d be buying a NOS rp23 & then speaking to loco for a personal tune.