This is certainly a wonderful place, however I have grave misgivings about ever visiting again.
I don't need to describe the majesty of the place, many have done that before me so I want to outline a few problems and issues.
Firstly, the cost. M.P. has become an out-of-control money making scheme. The return train ride costs a minimum of $60. The bus from Aguas Calinetes a ridiculous $15, and the site itself an incredible $40!
Secondly, the site is under grave threat from tourism. Because of the vast amounts of money being made from visitors to the site there is not control over numbers. I arrived at about 7am, and the place was relatively empty, but by 10am it was totally overwhelmed. There must have been thousands of people there, and sadly not all respected the place properly. I saw several people climbing over the ruins, which just astounded me. At this rate the place will fall apart in 10 years.
Thirdly and finally, Aguas Calinetes has no development plan and is out-of-control. The worst part of it is the fact that the town's waste is all dumped in the Urubamba River.
So, yes M.P. is a fabulous place, but think hard before visiting.