FWIW, I sold my Hyside Paddlecat (that I was using mostly with a small NRS frame) and bought Sotar Legend cat tubes. If I had been using the paddlecat to R2 as I thought I might, I would have kept it. (My wife likes to kayak, but does not like paddling from a tube -- torso twist.)
I've been enjoying having no floor. I have an extra seat bar that I slide on the rear of the frame if I am taking a passanger. Rowing the paddlecat, I didn't get the fore/aft weight distribution right, but I wasn't commited to figurng a way around that (adding weight to the front). I tried some Legends on a Rogue trip and just loved them. It is true that the cat frame is more complex than the simple NRS raft frame I was using on the paddlecat -- but I have a trailer and just leave the cat rigged. (I do like flintstoning in the cat.) As they say, YMMV.