I was wondering if you meant the sea eagle pontoons like the first one on this page: http://www.seaeagle.com/classics/
I've looked at these and think they look great, then I look at the float tubes and think, they'd be even better on a hot day.
One thing I like, but would prove problematic is hauling the trolling motor and battery. I'm not excited about moving 60lbs of boat materials, a 50 lbs battery, and a 15 pound trolling motor. So I begin wondering if a kayak would be better, or even a small canoe. All told, there are advantages of each type, but in spring and fall on a pond or small lake, that little pontoon would be awfully fun.