I was going to make my own "Dynabar" and decided after the cost of an effective-safe snap shackle, sacrificing a spreader bar, etc., it would cost only a bit more to buy something already tried, proven, and safe. After being on the Dynabar for many a session, it does enhance my kiting experience. If it did nothing else, I love how easy it is to walk up the beach with a sliding hook and how much easier it is to body drag with. The toeside turn experience is night and day verses the fixed hook. I use it on both my boardshorts harness riding strapless (sliding hook should be standard equipment on a seat harness) and my waist harness. I find the waist harness tends to ride up less with the Dynabar.
I expected an adjustment period the first time out, but there was nothing to it. It's automatic, doing what it's suppose to do when you need it too and I forgot it was even there. Newbies would also benefit from the sliding hook. If you're into hardcore wakestyle perhaps there's a debate over the pro's and cons, but for the rest of us mere mortals, it's in the category of "try it, you'll like it."
I use mine with the Power Wave Bar. It's smooth and I like the fact there's one less thing that can fail on the water verses rope failure over time.