The Hyside Padillac IK arrived. Haven't tried it solo yet, but thought I would give a few general impressions. I have been paddling my Lynx I solo, so the tandem Hyside felt a bit like a barge -- none of that one-stroke-turn-on-a-dime thing. I got a bit frustrated missing a few big waves because 1) with my GF in front and me farther back than in a solo boat, I didn't see them soon enough, and 2) I couldn't move the boat fast enough once I did see them to get to them (fine-tuning the communication between me and GF might help a bit). Of course, I didn't miss them all, but there were a few.
On the other hand, and this was the whole point of getting the Hyside, my GF felt more comfortable with the legendary stability of the Hyside (than in our tandem AIRE Tributary TomCat) -- I expect this will be even more the case when the water comes back up in the Spring. I expect the Hyside will keep her boating with me longer as the cfs comes up. She also liked the "ride" of the Hyside better, not as plank-like -- but I can't say for sure how that impression may have been at least partially due to how hard the boats were inflated in her trips -- no experimental design controlling for all variables!
As for my solo boating, the Lynx I is the bee's knees -- maneuverable and plenty stable at current levels. We'll see in the Spring high water if I prefer the relative extra stability of the Hyside or the relative extra maneuverability of the Lynx I (I'm thinking Lynx). Having fun!! (And now I'll also have to try out a Torrent SOT!)