I was drawn in by their amazing YouTube videos. While the claims that San Diego is the best place in the world to see Blue Whales is dubious (not even sure it's best in California), we did spot two blues yesterday on the full-day trip that put on an amazing show, staying on the surface for hours, not taking lengthy dives between sightings.
Our captain was Michael, accompanied by naturalist guide Nicole. They were both excellent at spotting animals and very knowledgeable and easy-going. Mind you, there were two of us passengers who asked a ton of questions, and they had all the answers.
The boat is a dual-outboard ~25-footer that comfortably carries the maximum 6 passengers. There is a portable toilet thing, which is nice on the long trip, especially if you're shy about peeing off the side of the boat. Beware, there's no place to hide from the wind, and if you're in the rear seats (best for bumpiness and sea sickness), it's also pretty loud. So dress warmly and bring ear plugs.
Gone Whale Watching stood behind their "guarantee" of sighting a blue whale on the extended trip, which at $300 is a factor in deciding to spend that much. The previous year, which was reportedly bad all around for blues, I did the trip and saw nothing, and they facilitated this repeat trip at no additional cost. I've been on many whale watching trips on larger boats and have really come to appreciate these smaller boats for their flexibility, intimacy, and ease of getting the best views without having to shoot over and around other passengers. Our group was very nice, all whale enthusiasts who were passionate about marine life, so it felt like I was amongst kindred spirits. This is not possible on a large tour.
While it's a bit of a drive for me, and the also-amazing Santa Barbara Channel is in my backyard, I would definitely go out with Gone Whale Watching again.