Hello - I'm thinking of booking a 4 day trek along the El Choro trail with a company called Terra Andina which is based in La Paz. The cost of the trek is not cheap ($1100 US for 2 people.) So I want to check first that the company is reputable as I can't find any reviews of them online. Has anyone trekked with this company before? Or have you used them for any other purpose? What was your experience of them? Thank you!