We did the Makalu Base Camp trek with Third Rock Adventures. We already had many trekking experiences in Nepal but with Third Rock it was the first time. For this trek we chose a local agent rather than one based in Kathmandu because the route is still relatively undeveloped and we wanted the benefit of local knowledge and contacts. We have no hesitation in recommending This company and the guide Gadul Tamang for other travelers. Naba always answered our email queries promptly and fully, gave us wonderful hospitality before and after the trek, found us an excellent porter and guide, and efficiently organised all the paperwork and land transport before and after the trek. Makalu Base Camp is a beautiful and relatively uncrowded trek, well worth the extra hassle and expense of the flight into Tumlingtar. But you need to be prepared for quite basic food and accommodation. Recommended for trekkers who have some experience.