tunalvr, Are you thinking of installing the hatch on the trunk cabin roof? Most of those have a radius...Best install would be to mold a bezel on the roof top so the hatch installed will bed nice and flat and level. From what i know, the leaking issues occur when installing a flat hatch on a curved rooftop - not so much due to any one manufacturer. Just something to consider from someone who had a leaker and spent alot of time fixing it
AND i hate leaking windows and hatches more that anything!!!!!! I also vote for DSG products..... awesome. I have their windows on my boat, not a drop of water comes in. My hatch is a Bomar, but my leaking issue was due to the installation..... Also key to use the proper bedding caulking.