Has anyone used Himalayan Holiday Service (P) Ltd for more than a day tour? I see reviews of day tours listed under their name here on TA, but no one seems to mention the tour service, itself.

I am considering booking a trip to Kathmandu, Lhasa, and Paro/Thimpu with them and would like some feedback. They've been wonderfully responsive via phone and email during the planning process, but was wondering what they're like on the ground. Thanks!