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rghdc said..wouldn't Kirk's S4 be a more advance and/or refined approach over the deep single concave on the Gong board?
This I would not say, part because I never rode S4s, and part because I do not think there is such thing as a "better" shape, outside of competition. We do not have a startup & a finish line with a chronometer, or a panel of judges with specific judging criterion (well, in free surf anyways :-).
I have had (and have now) wide planshape boards with double concave and five fin boxes. They are my favorite boards, the ones getting the most water time, and the favorite of users in the Gong line (for those interested: Faking, Mutant 2011, One ...). These are the kind of boards (in any brand: I would advise the L4 simsups too) I advise people to get if they want only one board for surfing, as you get the glide of longboards with the handling of modern boards.
But what I like also is the kind of "vintage" SUP boards that explores atypical and/or historical surf shapes with maybe a modern twist, but still keeping the original feeling. Perhaps because I was frustrated in my prone years not having enough water time to dare buy theses shapes (I remember drooling for weeks in front of a balsa Phil Edwards replica). The big concave and the twin fins on the tail definitely give a different ride. Is it better? who knows? - Is it fun? definitively yes!
But I also ride and enjoy mainstream "competition" shapes, "Anti-Simmons" (deep concave in the nose, belly pin tail in single fin, a bit like the "Comet" or the Takayama "Scorpion"), speed demons with 50/50 rails all the way, noseriders, ...
rghdc, I got my Simmons in august, but did not really saw something special. I enjoyed it in slow mushy waves, but it was on my "to sell list" to make room for new toys. Then, by accident in February, I used in waves that I thought were too powerful for its big tail, and my preconceptions were shattered... Why exactly, I don't know but this Simmons shape seemed to be at least as manageable in these conditions than the standard double-concave quads I had. I guess, but I may be wrong, because the Simmons shape have some kind of "latency" entering in the turn that help control the ride at speed? Anyways, I have removed it from my "to sell" list :-)
So take my post as an encouragement to try "weird" shapes. There is not a predetermined evolution path that board shapes should follow. I, for instance, would really like to try a McCoy "nugget" SUP version.