After 6 National Geographic/Lindblad trips, we made a change and went with Zegrahm Expeditions. What a huge difference after only one trip, we will never go back. We are heading to the Pantanal in Brazil with them in just a few weeks for our second trip.
Far better organization on the ship and the food was better. Even lobster, shrimp and tuna - you won't see any of that on a Lindblad ship.
Organized expeditions searching for wildlife, much more adventurous Zodiac trips, diving, snorkeling and they paid extra for us to have a daytime crossing of the Panama canal. We even got to keep our snorkeling equipment. This trip was hard to beat and a huge improvement over National Geographic trips.
We had one of the smallest cabins, but it was extremely functional. We had plenty of space including two huge closets.