I don't have much chance of racing one design out here, but I know after doing some shopping, there is no fricken way I could afford a high-tec racing main to be competitive. I am just new to this game and don't have deep pockets.
I am going to be saving for a new main, and while I would love to have an uber sexy 3DL or the like for PHRF racing, I don't know if the benefits would pay off. I am more keen on the big distance races where one might run into heavy weather, or need to play the big currents. When I am sailing in the dark scared crapless, I am not likely to be thinking about the performance advantages of a high tech main.
But, if there is a material out there that is near the same cost as a good Dacron, then I would consider it if its usefull life is similar.