I've tested one on the RC. For street riding it is definitely better than stock when properly sprung and I feel it was marginally better than the Elka where as the Elka took a slight edge on the track. I no longer have my specific notes as someone at Barber Motorsports Park decided that they needed my binder with 2 decades of data in it more than I did, but if memory serves it basically lacked sufficient rebound damping when you finally got a spring that would support the bike dynamically. I seem to recall an odd issue where the correct spring used for obtaining proper sag settings differed from the spring it needed for actual riding conditions.
In regards to track use it just paled in comparison to the Penske and shouldn't even be mentioned in the same sentence as an Ohlins.