I have at least a dozen sessions on the Dynabar and I feel no reason to return to a fixed hook. From day one, there was nothing to get used to. It just does its thing automatically and the best part is I forget it's even there. Since that time I tried it with my Liquid Force boardshorts, which I haven't used since I was a newbie. One of the limitations of a seat style harness is the zero movement on the harness itself. This makes for less efficient toeside riding, at least for my less than expert skills. Now that I've coupled the boardshorts with a sliding hook, it's become the best of both worlds, but this is the subject for a different topic - seat vs waist harness.
Other seasoned riders ask if I think sliding hooks like the Dynabar are a gimmick. All I can say is try one for yourself. Now I'm not into wakestyle , so for my style of riding: waves, freeriding, cruising, and working on less outrageous tricks, contraptions like the Dynabar are all upside without any minuses that I'm aware of. I'll never go back.
Someone asked about the Dakine sliding version. I too looked at one. I decided on the Dynabar V7 with the Pro Wave bar. For me it was a question of reliability and consistency. I suspected that the Dakine strap would stretch over time and would eventually need replacing. With all the things that can go wrong on the water, the more reliable the gear the better. The Pro Wave bar (It's not just for waves and is designed for freeride as well) works just fine without any stretch, and unlike ropes or straps won't break.
I too considered making my own sliding hook, but in the end for the additional money, why reinvent the wheel? It works, it's reliable, and it's safe.