I have the original 4m and 5m Duotone wing and just recently got the Naish S25 5.3 with the goal of learning to use handles. I also have 6m and 4m Echo’s on order but have never ridden them yet. So I can only compare to the V1 Duotones

My feeble opinion; booms are all I’ve ridden since starting about 6 months ago. You definitely get used to what ever you started with, and yes the infinite “no-look” hand positioning is great. Doing the basics with the Naish S25 has been a pretty easy transition (just riding and jibing). Tacking with the Naish has been more of a challenge for me in part due to my limited feel for handle switching and in part due to different flying behavior of the wings.  That “V” shape of the Duotone that makes it so unstable during lufffing, also makes it roll side-to-side easily during a tack. The Naish needs more of a push to roll over. Again maybe just my limited skill level being the reason.

On the other hand the Naish S25 is super stiff, so it pumps really nice to get you up on the foil, and it has much better upwind capability compared to the Duotones. Still even with those advantages I didn’t hesitate to order new Echo’s even without any real independent reviews out yet. It always comes down to personal preference. I think the S25 is a great wing, and I suspect the Echo will be a nice improvement as well....