anyone been to Machu Picchu

OK, found a friend who wants to do the 4 (or 5) day hike to Machu Picchu.
Just checking to see if anyone has been and have recommendations for a tour company for the hike.
If we go this year it will be in October as June-August permits are sold out and not many left for September.
If we go next year it will be March or April.

Thanks for any information.