Hef, the Jackson Coosa is a good yak if not a great yak, I have been using one all summer and have not one complaint. I don't fish lakes out of it, that's what my boats are for. The Tarpon is a good yak too there is nothing wrong with either yak I have paddled both, I have only done two float trips with the Tarpon but, it's very nice.
Don't let anyone scare you from either.They both are not going to track all that well but, I was able to paddle from our old cabin below Blue Springs Creek on the Meramec upstream to the boat ramp almost a mile with no problem in my Coosa.I like the Coosa because of the options in seating and it's stability. The Coosa is also heavier because it is millimeters thicker than most yak hulls, I don't care about picking up 65 pounds vs 45 pounds that dosen't bother me. I want my yak to last for years while I abuse it on the rivers.The seat on the Coosa is not a low quality seat whoever told you that is high. Bottom line is both a Tarpon and a Coosa are well suited for Ozark streams and rivers, they are both killer choices.