First, we did see a variety of wildlife, sloths, vipers, foxes, and quite a few arachnids and insects.
That said... we were in a group of 8 people, and of that, half were extremely noisy, giggling, yelling, stomping thorugh the brush. I can pass that off as a hazard of going on any group tour with people you don't know.
However, there were about a half dozen such groups all in the same relatively small area, all noisy, and I feel that this seriously hampered our ability to see much of anything. Our guide took us away from the crowds near the end of the tour for about 30 minutes, which was a welcome respite, but aside from a few lizards and insects, we saw very little.
Overall, I think the tour has potential, but noisy cityslickers and hooting crowds do not make for a sight-filled wildilfe tour.
If I could do it over, I would have searched for a private guide.
If you have children, or are just looking for a chance to see a few things you've never seen before, go for it, but don't expect to see a lot.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.