If the Griptillian had the assisted opening I would be ALL OVER IT! That's the reason I never got the full size, I have the Mini, but my main carry is my SOG Flash II because of the assisted opening, use it ALL the time with one hand in tight spots that slinging is not an option...
FWIW, the RSK has dual thumb studs so is easy, ambi one-hand opening. Of course, the full size also slings much easier than the mini so I rarely use the studs at all, but if that isn't option the use of dual studs on the RSK are well thought out IMO.
-john