I've been extremely satisfied with my steel rail mount version also. Only weighs about 35 lbs and it works better than any fifth wheel hitch I've ever been around. Completely smooth and silent and it does very well on uneven terrain which is an important point to me given the remote areas we often camp. Drop it on the ball and twist the lock and there's never any question about whether you're hitched with no pull test needed.
As mentioned, about the only folks who ever chime in with negative comments about the hitch are the ones who've never used it.