The Pro Fisha 575 is approximately 1mph faster than the Fisha 500. Its turning radius is not as tight and with its longer hull it takes a few extra strokes to turn it up into a stiff wind. That said, once you are headed into a short choppy sea it moves more steadily than the Fisha and seems not to stall as easily and overall gives you a quicker ride in those conditions. It has a quicker moment which is not to be confused with instability. For those changing from plastic, the ride will feel a bit twitchy at first but that feeling goes away quickly. The glide is longer and like the Fisha uses less energy over a day on the water. I have found that while it does not drastically effect performance or speed you do feel some sluggishness with significant weight in the fish hatch (50 lbs and above) with the Pro Fisha while it does not seem to effect the Fisha as much.
There is a lot of talk about stability in kayak fishing. This ski is not unstable, as previously mentioned the Pro Fisha has a quicker moment but I have leadered Marlin in the 150lb range with no more concern about stability than the Fisha. While there are many reasons to choose one Stealth ski over another I personally do not think stability is one of them.
-Review by Tim Bauer