I have the RAV853 VC forks on my Sherpa and Audax. Sherpa on 26 x 1.6 tyres, Audax on 700 x 28. I have ridden gravel cycle trails, canal towpaths etc on them without any problems, and both have also had quite a hammering from poor surfaced urban roads - often worse than any light trail riding! I would have no hesitation in recommending them.
Are they more comfortable than the 'normal' forks? I'm not sure, nothing really to compare them with. But both bikes seem to me comfortable and secure.
Lewis