Denny Rickards swears by it. They are cool.
I wouldn't compare it to the Navigator II at all. The Navi being one pice will be more stable than two pontoons on a frame. You do get a little pontoon slap if they are not installed correctly where as the Navi you can't.
I wanted one for quite awhile but the price was a bit high for my needs.
I bought the Venture Outdoors Echo instead with a very do-able price. No rowing capacity, but could be made real easy. I use it on small lakes so haven't done it....yet.
Plus the seat on the Echo is THE BEST! Molded plastic with padding, plus two straps that can be tightened or loosened to tilt the seat back or straight up.
Side bags are HUGE! Plus I put a deck on the back. and the apron is the best I have ever seen.
Pontoons, 4' long and 12" diameter dura bladders (harder plastic like rubbermaid garbage cans with a self sealing powder in it.) They can be deflated, but not totally like Vinyl or Urethane. Price: around $350.
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