I just got today the big tuna from skwoosh. I barely looked at it as I was leaving for work, but will provide a detailed report after I look at it. I love my 2006 AI but hate the seat from hobie. It's weak, and bends back causing a backache over time.
I got the Big Catch from Skwoosh for my birthday. What a seat! A 7 hour trip and 2 of those hours pedaling and paddling against a 20-25 MPH headwind and 2 foot waves and no backache afterward. No discomfort at all. The lumbar bar is awesome and adjustable or removable. The tackle bag on the back of the seat is nice and the rod holders are ideal for a net or a rod.
Just a really nice high back comfortable seat.
Only modification you need make is add one padeye each side close to the ring for the well bungee hook to connect the rear straps.