I paddled the 532 last weekend. I am currently in the market for a new kayak and (with a friend) hired both the 580 and the 532. I had thought the 580 was going to be the boat for me, but it was built for a slightly heavier paddler (I am about 70kg). I didn't have enough weight to get the advantage of the longer waterline of the 580. The 532 fitted me like a glove.
The seat was comfortable for 4-5 hours of paddling. It was nice and stiff and with the integrated rudder could turn very swiftly. It is fast and quiet. We paddled in the creek and the harbour. Primary stability was fantastic. I didn't push it any further than that.
Bottom line is that I have ordered a 532 and can't wait to get it. Beautiful looking boat and handles like a dream. Can't wait to get my boat. Looking forward to all the new places I will be able to explore.
I will update this review when I get mine and have taken it out a few times.