Seat 24/7 . No one could ever convince me waist are better than seats. Better leverage, more comfortable, bar in reach , and no broken ribs.
Buy a sliding bar to go with it . Going toe side with my Dyna bar is a breeze.
All of the above.
I too am a fan of the boardshorts harness combined with the Dynabar sliding hook. As for the waist harness, I don't miss the potential bruised ribs, the harness slipping up, and the occasional "iron maiden" constriction - I like being able to expand my rib cage and breathe freely.
Preferring a slightly higher hook vs the Dakine Nitrous, I like the Liquid Force Styler Boardshorts Harness. Both are excellent however. Check out the ION B2 as well. My friend swears by his.
I think the best compliment you can give any one piece of gear is forgetting it's ever there. Compared to the waist and even the "diaper style" seat harness, the boardshort's harness is the last piece of gear I ever notice having on.