My sister in law and I went with Sotos in 2003. It was an excellent excursion. We had a marvelous time and there were no problems at all. We thought that there might be a problem because the price seemed to good to be true. That was not the case.
We were picked up a block or two from the tender drop off and taken to their boat. Our guides were terrific and we had a great time. We saw amazing things during our snorkeling and our trip to the stingrays was very personally oriented.
Have no fears and have a great time!