I've had the Sirona for 3 month now, and have a little more than 250km in it. Sea and lake, various winds, waves and flat water. Compared to my Valley Etain 17,7, the Sirona is much more versatile. The Etain is tracking better and is faster, but the Sirona is much more fun. It turns soo nice when edged, and reacts predictable when in even bigger waves. Though it reacts as I expect, it is still not too lazy. The Sirona feels easy driven and alive at water, and I have no trouble following others in a group. Normal speed on flat water for me is aproxx. 6,5 km/h with an eskimo paddle, while it is around 7 km/h in the Etain.
Of course the fin is much more at use in the Sirona compared to the Etain due to the rocker line. I have to adjust more precise in the Sirona, but then again the Etain almost doesn't need the fin on calmer days.
As the cockpit and seat are the same in both kayaks, there is nothing to complain about. The seat is very nicely designed, and I can sit in both of them for hours.
I cannot say that I have one to many kayaks, but if I should choose just one, I would go with the Sirona.
