The concensus is that the DFII is the hot ticket, although I bought my 200H with a RAD valve on it (I also received the stock reed valve the previous owner had taken off). I put the old stocker setup on just to compare. The RAD valve was way snappier and more responsive than the stock reeds. It's a pretty significant difference. I've never ridden a KDX with a DFII so I can't give you a comparison there.