Custom molded electronic ear plugs

Does anyone have experience with anyone in the Fort Worth area that makes custom formed ear plugs for shooting? Looking online there are a bunch of different dealers in the area and before I spend the money I would like to know if any of y'all have an opinion.

Thanks in advanced

Not cheap, but a few people on my son's Clay Target Team shoot with these. My son uses muffs.

http://www.proears.com/Pro-Fit-Custom-Ear-Plugs

Charlie