I have 2 ocean kayak prowler 13' SOT and love them. I'm 6'3" and was 250 and could stand on them to fish. Attempted to roll it and rocked it as hard as I could and all I did was roll myself out. Like deetz said I even climbed back on with no problem. I like the room of the SOT compared to the SIS. I use mine for fishing and waterfowl hunting. I have an 80lb lab that goes with me and can jump out, retrieve the birds and I can help him back in with no problem.
I took my yaks to the ocean and they work like a charm to take the bait out past the surf. My buddy brought his SIS, the locals call them "die insides", and watched him swamp his 2 times before he put it up and used my extra.
I've used it on creeks, rivers, lakes, swamps, ponds and the ocean.