Have never flown a 19m, but I have a 17m that turns as fast as an average 12 or 13m. And, this kite has a front line adjustment on the leading egde that enables it to sit more forward in the window. Also, due to the thin leading edge/struts it's fairly light and does not fall easily. These attributes make it great for upwind wave riding where it almost
feels like real surfing, but not quite(especially in the bottom turns). However, you can still let go and feel the power of the wave and pull off some similar moves as you do in surfing. And, with the kites power, you can make some difficult sections that you coundn't freesurfing. So, a slightly blown out day can be fun
(and that's most mid-days for us)
I'm totally in agreement that it's more ideal in side-off 6m-9m conditions. However, you take what you can get. Lastly, I'll try to get Juan-Carlos to take some vid of our next swell so we can show you that it's a little more than just "Cruising"