I think Super Shuttle can only be considered reliable if you are taking them from the airport to your destination. But S.S. really messed up my plan when I had to get to SFO a couple of years ago. I booked the private option to the airport several days in advance for an early morning flight. I hadn't flown for many years prior to that, and I was flying alone, so I was nervous about getting there on time and I didn't want to make stops along the way. The morning of my flight, they texted me twice informing me that driver X, and then driver Y were on their way to pick me up. Expecting someone to pick me up any minute, I was waiting in my building's lobby. I then got a phone call telling me that they couldn't get anyone to pick me up for my flight that was a couple of hours away! I was furious, and the only thing they tried to do was offer me a cab, but they couldn't tell me when it would arrive! I threw my luggage in my car and drove to SFO myself. I was surprised that traffic was very light at that time of the morning because 101 traffic is notoriously bad on the peninsula. But as I got into my car, I was worried that I would miss my flight. Luckily, I made it to the airport on time. I emailed S.S. to let them know how awful and unprofessional it was to leave someone in the lurch like that. The response was as pathetic as it was generic. They didn't even offer a discount coupon as an apology. I will never use them again.