I have the Mopar (Curt) 20k slider hitch along with the Mopar picture frame adapter in my truck. I had the hitch thrown in on the deal on the truck at no additional cost to me.
Overall I like the hitch. It is quite easy to use and there is no question when it is hitched properly. I also find it quiet with no clunking or banging. I also found the sliding feature works quite well; it has large steel rollers and the release handle is large and easy to use.
The things I don't like it include having to jack my trailer quite high to hitch it up. Although it is a 4 way pivot, the hitch head is quite "stiff" in it's position and does not naturally lean towards the back of the truck to allow easier hitching like my Hijacker hitch did. The hitch is also heavy as he!! and must be disassembled to remove it from the truck. I suppose this is the nature of the beast with a sliding hitch rated to this capacity but I find it to be a pain because of the way the hitch head bolts to the roller frame and the way the frame bolts to the picture frame adapter. I have actually contemplated buying a utility trailer to avoid having to take the hitch out of the truck every time I want/need to haul something.
Overall I wouldn't hesitate to recommend the hitch if a good deal is to be found on one. It handles my 16k fiver without any issues even on unlevel ground.