If you look at the review ratings, it appears Hidden Canopy is headed toward setting a record for perfect traveler reviews. My review for a visit in March, 2011, (Traveler4230) raves about Hidden Canopy and is fairly typical of the reviews given by other travelers.
Occasionally a traveler finds faults with Hidden Canopy. TripAdvisor allows owners to comment on negative reviews, but there is no provision in the Review section for other travelers to comment on them. I suppose this is good as it keeps the Review section from becoming a discussion forum.
Recently, a traveler's review suggested Hidden Canopy might be steering guests to particular tours because the Hidden canopy staff (in this case Cynthia, a wonderful person!) might be receiving some type of financial return from the recommended tours. The example of a zip line tour was referenced.
It is true that Selvatura and SkyTrek are the big name zip line tours in Monteverde/Santa Elena. It is also true Hidden Canopy recommends the Original Canopy Tour. I experienced both sides of this debate and, on balance, I think Hidden Canopy recommends the Original Canopy Tour not because of any financial arrangement but because they truly believe it provides a better tour with more personal service than the big name tours.
Please read my review of the Original Canopy Tour, which you can easily find by looking for reviews from Traveler4230.