We did this tour about 2 weeks ago with Erik as a family of 4, and it was everything we expected. This was our first trip to the Big Island, so we booked this trip as a starting point to see the highlights. Erik was knowledgeable, easy-going, able to answer all of our questions, and knew everything about the rocks and lava (and there are a LOT of rocks and lava on the Big Island). He has personal connections at places like the coffee farm, the lunch place, and the store next to the lunch place, so it feels like you're with someone who really knows the island. You do spend a lot of time in the van, but that's because of the size of the island, so it's unavoidable no matter which company you choose. It was a long day, but we learned a lot and I would definitely recommend, especially if you are someone who likes science/geology/environmental science.