I have a pair of RST 200K forks on my R20. The earlier version came with bolted crown so that I could cut the stanchions down to get the right geometry, unlike the linked pic above which leans over backwards, as does LittlePixel's.
As for the quality of the forks, I am super surprised by their performance, very plush indeed but still damped so no bobbing when putting the hammer down. Minor bobbing when standing up a hill but I have thought long and hard about it, I have reached the conclusion that is one case where suspension does not suck away power.
So all n all, I don't think I would have gotten better performance from any other fork out there. The R20 is without any doubt my most comfortable plush bike. (I could be lucky that I got a good one.)