I have traveled extensively in Asia and completed 5 separate treks in Nepal, Tibet and Bhutan. Of all those trips, the Windhorse trip was exceptional. The guide was extremely knowledgeable and we had a fantastic time. We did both an arduous trek and did visits to monasteries and other cultural sites. When my wife developed altitude sickness on the trek, the guide made arrangements to have her carried down 3000 feet on a horse. She recovered the next day, and we completed the trek. I was very impressed with not only Bhutan, which is a gem in the Himalayas, but with Windhorse services as well. They have my highest recommendation. Oh, one suggestion. Check your itinerary carefully and try to not climb more than 1150 feet in altitude per day.