I did Khopra trek this year. Before this trek, I had lots of question. I texted on Whatsapp to Naba and he answered to all my questions. He didn't rush to book, instead gave me enough time to think, and rethink. In that time I checked their website, and reviews and social media. I loved their presence and recommendation. I chose this trek, because it's lot less known and less crowded than ABC trek I did before. Everything was perfectly well organized and from the beginning I felt comfortable. I had really experienced guide (Rishi). I totally recommend Third Rock Adventures for Khopra ridge trek.