We recently used Sunset Tours for our trip to the Pampas in the Bolivian Amazon. We booked our trip upon our arrival in Rurrenabanque, Bolivia without any hassle at all. Before booking we searched around town and interviewed several other tours. We found the people at sunset to offer a similar trip as much lower prices (although we later heard of others paying the same that we paid at other locations). The biggest positive to booking with sunset was the flexibility they showed us when Jillian was ill on what was supposed to be our first day, allowing us to push our trip back without any problems or fees.
Most importantly though was that everything was as described and we had a great time. The food was all surprisingly excellent given our location far from civiliazation and the lodging was quite comfortable as well. We also felt good about supporting local labor and owners in a new business venture.
The only problems we had were with our transportation. On the first day the car broke down several times and on the final day it was late to pick us up. Additionally, we were told the guide would have an intermediate level of Spanish and while we were OK with the fact that this was not the case, several other non-Spanish speakers were quite disappointed.
Overall we had a great time on our trip to the Pampas, the food was good, the guide was great, and the memories will be forever.