After buying the Dakine Nitrous shorts last year, I added the Dakine slider bar as it was near impossible to ride toeside easily with the fixed hook.
Toeside riding is improved massively with the slider and it takes all the strain off your hips and is super comfortable.
It does change the way you ride and affects boosting as you seem to pendulum alot more. You can't rely on the harness to pull you around in carving turns anymore and need to rely more on planing through the turn and timing the kite better.
www.surfsailaustralia.com.au/product/da-kine-kite-push-button-option-spreader-bar#surf-sail-clothing-hardwareBe a bit careful with sizing so there is enough adjustment space left, the 10 inch bar works for me with the xl shorts
Overall it is awesome for riding strapless surfboard and foiling, but takes a bit away from twintip riding. Takes a few months to get used to it but totally worth it.