My light weight, long throw set of handles (made after following Jeff's recommended modifications, then opting to better 'em even further myself) are made of grade 5 titanium tubes, about 19 inches long or 17 measured across the gap, 3/8" diameter with custom fishing grips from Glenn Haynes. I bent the tubes myself, so most of that bend happens immediately after the hand grip (I grip at the top unless flying precision, like the reverse octagon figure, then I'd change my grip lower, so my little pinky finger could grasp at the bottom of the foam).
Jerffery Burka also possesses a set of Mike Van Meers' custom wooden handles with the grips fashioned to fit your fingers anatomically (each side is mirrored to the other handle) like a pistol's shaped finger grip. The beauty of this design is the ability to rock the handles onto different finger positions! They are not as long as jeff's Rev2 set-up, but extremely comfortable over a long day of flying. I'd love a set of those, but have been waiting at least a dozen years to get them into my grasp.
The long throws are not comfortable in a big wind, but in "none at all" I find them a very much & frequently used piece of equipment. With longer throws you need less action elsewhere (kite, hands & feet) and can do some very flat styled slack line stuff or aggressive movements to reload the sail as necessary.
Like anything else, it is all about what you are most comfortable with,... personally? I find long throws with very little mass to be a secret weapon when conditions warrant all you best stuff. My Ti 17" handles (measured across the gap) weigh less with a 120 feet of 90# LPG lines wound on them than the stock no-snag solid aluminum handles at 13 inches (without any lines at all!). I've had them run-over by a squad car too, on the national mall without any damage. Light and strong, little mass to move and little movement necessary to have a huge impact on the kite end of the strings. S-W-E-E-T!
Jeff's my 1st quad-line coach and every time I think I've finally got it going on he humbles me yet again! Great guy though and quite humble himself, one of my favorite pilots to share a quad field with during the day. Thanks for everything you've offered me in techniques and equipment over the years mister Burka, I'm still not worthy!