On flat water, speed potential is very high. For 1+ hr workouts, 6mph is a very sustainable pace including turnarounds and zig zags around bouys. The only downside to this boat is its unforgiving nature. To go from a beginner surfski to this will require total commitment and lots of swimming. After some time, the hull is much more comfortable. I just swam a lot for the first month of having this boat. Now, after 3 months, I can fly on flat water, and feel quite stable. Still working on the rougher water.
Overall, an excellent quality boat with really high performance potential.