My girlfriend and I found Max on TripAdvisor and we are happy that we chose his tour company.
On our first day in San Ignacio, we stopped in to introduce ourselves as the couple that was emailing back and forth with him for the previous couple of days. Our trip wasn't for another two days or so, but Max was welcoming and that evening when we were eating dinner next door, he even introduced us to his family.
Fast forward a few days to our trip to Tikal. We met up with Max and piled in the van that would take us to the Guatemala border. From there, we went through customs and took another van the rest of the way. Max took us to a very authentic Guatemalan rest stop that actually looked like the owner's home.
The trip itself was great; sleeping in a hotel in the jungle, waking up at 4am to get to the temples in time for sunrise.
I believe that our tour lasted about 30 hours and he kept us out of trouble every step of the way. Max seems to be friends with almost everyone from San Ignacio to Tikal. This was comforting because I felt like if anything had gone wrong, he would have been able to get us help.
Also, I forgot my credit card with him after I paid. When he realized it, he took it over to our hotel, but by that time, we were already on the way to Cancun. There were no suspicious charges from that time until I reported the lost card a week later. Max is trustworthy and took great care of us. There were no hidden fees during the tour. I believe that we only had to cover the border fees into Guatemala, something that we were told well in advance.