Myself and my Fiance (Australia and Germany) are both quite experienced trekkers. We generally do all our own organizing, carry our own gear and cook for ourselves, so the thought of doing something so rigid, structured and expensive as the Inca Trail didn't seem so appealing. But after doing research and discovering that this is the only way to see the famous route of the Incas, we reluctantly decided to spend the money.
In hindsight we both agree that the money was suitable for the attentive nature of the guide, the quality of food and the fact that however you decide to see Machu Picchu it will be expensive. We carried our own gear, and didn't see the need for additional porters for us. We also had our own sleeping bags and mattresses of a higher quality than those provided by the company. Everything went well, although we did have one wet day, the toilets were often filthy, and the path busy on the final day.
We have no regrets and are happy to recommend Inca Trail Reservations .
Do book early though, and perhaps avoid the wetter months, but possibly the hotter months also, as it can be very warm on exposed sections of trail.