Not all the buses have power plugs and wi-Fi. Lack of bilingual capability is a negative. But they were friendly, and I felt pretty safe. A big issue developed later because we crossed the border and they didn't have me check-in, and so when I flew out in a few days, there was plenty of hub-bub at the airport, and they let me board despite the lack of immigration card. Probably Tufesa said the announcement in Spanish and I missed it, but a little English would have been nice at the border. The flight ended up $90 one way (Volaris) vs $60 by bus. No comparison... definitely fly (Phoenix to Hermosillo).