I highly recommend it! Did my first one last week in CO, and will be doing more in the future. While hunting is my primary motivator for staying in shape, I found I needed a little extra kick in the tail to keep it going all year long, so started looking for other challenges to do throughout the year. training for and doing a Tough
Mudder is as good as it gets for mountain hunting training. The combination of distance/endurance, the more physical challenges of the obstacles, and the mental grit needed to grind it out have me feeling pretty prepared for September, and we're not even into July yet. I was quite pleased with the way my legs and lungs carried me up Death March!
TM is billed as a teamwork/camaraderie event, where finishing as a team is more important than course time. However, there is nothing that says you can't sign up and do it as an idividual. The amount of people, both from other teams and individuals, willing to lend a hand will not leave you feeling lonely on the trail. In fact, based on your fitness level, you'll likely settle into a pace with others on the same level, and end up running the course with these familiar faces all day long.
One suggestion from my experience - I focused a bit too much on running during my training, and not enough on upper body strength. I was running 20-25 miles/week and I reached the point where long runs on weekends were 10-12 miles, longest was 14. If I had to do it over again (and I will) I would back down on the running and commit more time to strength training.