I was there for the 12 day retreat. The location and the tambos are beautiful, serene and basic. They focus on healing and not day jungle adventures like some of the others, in case you might be looking for that.
I found the curanderos to be very gentle and had a good vibe about them. The facilitators helped the group and led us through the experience very gently and nicely without forcing us one way or the other. They were there to help if needed. They also treated the shamans and the ceremony with a lot of respect and humility.
I guess it also helps that the group you end up with is a good one.
The first dose was a small one, and this was understandable (other places are probably like this as well) as they need to understand how each one reacts to the medicine. After this the dosage is left to you and what you are comfortable with.
It is also amazing that we had 5 shamans conducting the ceremonies and it was wonderful to hear the different icaros from each of them when they sing to you personally or when they all sing in unison. It blew my mind! This is really one of the positives.
The food was excellent and i had a life changing time when i was there. I would gladly recommend the temple to anyone.