I've done the relay four times. I have never run any of the other events of the Colfax series, but based on my experience with the relay, I probably would. It's a giant event; every running in Colorado seems to run it. But for being huge and crowded, Colfax staff is alway well organized and supplies all the info you need to make your way around. The expo for packet pick up always has a ton of sponsors and is fun. The process to get your packet and swag is spread out and long, but forces you to walk through all the sponsors. On race day, there's not much parking, but street parking is close enough. The organization of the coral system is always fun. I'm not a fan of the course (all road in the dirty city) but others seem to like it. I always choose the first leg of the relay because you get to run through the stadium. After you finish the leg of your relay, it's easy to get back to the expo. If your teammates can't pick you up, there's a ticket for the public transportation to get you back to the expo easily - and you can find all this info in your packet!