Third Rock Adventure is a great company for Nepal adventure. I landed on their website while searching for Mardi Himal trek and checked their EBC itinerary and I loved this one. I also checked their other information and most importantly the reviews on the website and Tripadvisor as well which convienced me to do the trek. The price is too good to be true and Naba's attention to detail was impressive. His guides are experieced and perfect for anytrek to Nepal. They must have been doing the treks since years. I want to recommend their service to you for treks in Nepal, specially heli service.