Super Glide hitch Vs. other gliders
Do your measurements and estimate what the largest turning angle you will ever need. Sometimes the extended pin box is enough to not need a slider, or need a slider rarely, and sometimes not. In my case, my pinbox is so extended that it runs into the side of the bed (long bed) before anything else comes close to the truck. With my trailer, I couldn't make a maximum turn with or without a slider, even with the long bed.
Yes, the SuperGlide is pricy compared to some other sliding hitches, but as I understand it, the 'slide action' happens automatically as you turn. No more stopping, getting out, unlocking the slide, pulling forward a bit, getting out, locking the slide, making the turn, getting out, unlocking the slide, backing up a bit, locking the slide and only then continue on from the turn.
Of course, if you are getting the slider feature only for emergency use, then it may only be worth the extra $100 or so a manual slider seems to run. But if you expect to use it much and if SuperGlide can get rid of that hassle, sounds like its worth $800 or so to me... Also, the maker of SuperGlide (Pullrite) claims their hitches are much closer tolerance than other hitches, eliminating the 'startup clunk' of other brands. If I was getting another 5er hitch, I'd check out the Pullrite first, whether or not I needed a slider (and assuming they have a non-slider).