I did Thorong La Pass trek with Third Rock Adventure this year and loved it. I was surprised by the way they manage everything, their connection and good relationship with local people... It's amazing. Naba the main person behind the company personally met with me for brief discussion. It was such an amazing gesture. We had good talk before we traveled to the mountain. the unique part of this trek was the heli return to Kathmandu. Everything was way too great.