It was one of the best experiences in our lives. We strongly recommend that anyone of moderate fitness and above to try it. It is good to have a pair of hiking shoes to make the experience better. Our guide (Willy) was amazing, he helped us a lot with the trail, he was well prepared and we didn't feel any risk at any moment. Also, he was very explanatory about inkas history and the monuments we saw during the trail. The quality of this experience is very related to the tour guide you will select. This guy was one of the best tour guides we had so far. There is no comparison to the other guides we had. We strongly recommend this experience with this guide.
PS#1: bring a second t-shirt with you to change before you take the traditional photos of Machupicchu.
Ps#2: Willy is a very good photographer, and gave guidance about the best place to take photos.