Has anyone had the opportunity to work with either Carmichael Training Systems or 53x12.com? I've browsed through both of the websites, but was unsure whether or not it was a worthwhile investment. I've read Carmichael's books Food For Fitness and The Ultimate Ride. I've also just finished reading Friel's book. Is there a significant difference between working with one of those companies or just trying to create your own training program? I've raced in the past, but this is my first serious year of training. I'm anticipating riding about 18 hours a week. Thanks for your help.