i started life with nappies, but after discovering windsurfing tried a seat harness and never went back. that was until i discovered wave sailing, when i realised (like millions before me) that having unrestricted movement in the leg department and sailing un-hooked a lot of the time anyway, was more than a fair trade off for the lowered centre of gravity, and subsequent speed and edging ability that a seat harness offers.
by the time i started kiting (late last century) i had all but given up seat harnesses and was using my da kine wave harness for all disciplines of windsurfing, including course and slalom racing - the only exception was dedicated speed sailing.
naturally i continued using this harness for quite some time - until it completely blew to pieces after a particularly violent kiting crash. i started raiding my backup supply of windsurfing harnesses, only to find they suffered the same fate only faster. regardless of harness style it became clear to me, the new loads that kiting produced were in no way on the designer's minds - a bizarre trend that continues to this day.
from then on, my harness use was entirely dependent on whatever serviceable harness i could get my hands on for a specific session. i tried scores of north, neil pryde, a.r.t, peter lynn, maui magic and da kine varieties and when all these failed, various elaborate webbing and string reinforcements - bastardised hybrids and other bizarre creations featuring quick-draw carabiners and the like.
why can't someone make a harness that can withstand the rigours of kiting for longer than an afternoon, allows use of the legs and future procreation, and doesn't ride up with sudden force right into the vulnerable lower ribcage and the organs sheltering behind? no-one has been able to answer this question.
when i break it down, what we inherited from windsurfing are harnesses and footstraps - besides occasionally skimming along the water these are the only two similarities between the sports.
kites, lines, bars and boards have seen spectacular development, but it has literally taken years before even footstraps have been re-designed for use by kiters.
harnesses have made no such improvements. we are still debating the pros and cons exactly like the windwackers were at ho'okiipa in the 80's. yes, waist harnesses look marginally better but they have the well documented tendency to break the ribs of those who ride hard. this can happen from a sustained upward pull, or more commonly from being dragged backwards on the surface of the water and the back of the harness catching, forcing unimaginable leverage through the spreader bar.
seat harnesses are a little safer, a little gayer and a lot more versatile.
despite this, and with the economic realities (let's face it any harness costs as much these days as five nights in phuket) when my current one breaks i won't turn my nose up at any style of harness, as long as it gets me back out on the water for another sesh.