I previously had a 2012 zephyr, the zephyr was a great light wind kite but for me was just too slow to turn to play in the small summer waves here, every other aspect was great but I wanted something a bit different for my local conditions. I've used the zephyr here and Bali, fun but not exactly what I wanted/needed. To each his own.
Finally had a decent session on the 17m griffin trx today in 9-13 knots, (2.30 to 4. 30 pm see BOM chart aireys inlet vic ) mostly 9 -10 knots with just a hint of white caps on the water, an incoming tide over the reef and channel probably robbed me of 1-2 knots, so now I know it's bottom end (for me ) I'm pretty happy, would be a handful at 18 + knots but I'd downsize at 15 knots anyway so it fits the low wind window I was after.
Stats today - 82 kg rider on a 142 x 40 underground flx double concave bottom. The trx is a 3 strut low aspect, close to a delta style kite. I have no connections with griffin at all, I do have a 7m 09 griffin that is a great little kite, rarely used due to lack of consistent big winds here but fun over 25 knots.
I spent about 2 hrs today on the trx, took a good half hour to get the feel and get some performance, in the end motoring upwind and playing in small reef waves, I don't care about the physics or characteristics of how it turns, but it does turn fast for a 17, suits what i wanted from a big kite, definitely quicker than the zephyr, for me anyway. The zephyr might wind an upwind battle but the trx performs upwind fine for me.
So at the end of the day, I'd rather kite all day on a 7 or 9 m kite but that's just not feasible here, so im very happy with the 17 trx for my kiting and locations, may not be for everyone, Will definitely be taking it to Bali next year.
Only negative would be pretty heavy bar pressure but I might be able to tweak that a bit by trying different knots on the kite rear lines, then again the zephyr was fairly heavy as well and the 2012 had no adjustments on the kite.
Be interesting to see if the bottom end will be much different on my 6' surfboard.
On a side note, yesterday was a nice 20-25 knots, about 20 kites and a dozen pole dancers out, today just me, the trx, sun and fun, why would anyone want a big kite ?