Review posted on behalf Eric S. of by Tom the Shop Proprietor: I just want you to know that I am extremely pleased with the Sea-Lect Performance oval hatch covers on our Necky Chatham 17. They fit perfectly and are not at all difficult to install. I also am quite pleased with the convex surface of the covers. I realize that they don't add much capacity to the hatches; but from my perspective, their convexity is better than the concave surface of the OEM hatch covers on our Wilderness Systems Tempest 170. Thanks again for your great advice!