When the technician arrived, he was efficient, friendly, capable and fast. Unfortunately, he arrived nearly two and a half hours after my "window": I was told he would be there by 8:18 a.m. and he arrived after 11:35 a.m. Before he arrived, I spent a long time on hold on my cell phone - which I could not charge because my car battery was dead - trying to get confirmation that he was actually on his way, since he was so late. If your original email had said to expect him after 11 a.m., I would not have been sitting in a hot car on asphalt for all those extra hours. I would have gladly shown up at around the time I should have actually expected him...and would not have dealt with illness caused by heat exposure. It is far better to underpromise and overdeliver, than to overpromise and underdeliver when your entire business is based on helping people who are stranded with a dead car.