Just look at the Porter thread which got banished to the other airlines forum as soon as it became apparent that it will be a successful airline.

My friends took Megabus last Friday, there was only 12 people on the evening departure, the bus they said was great, and it took 2:30 to get to BUF airport, where they stayed overnight for the morning flight. In this case, even with hotel, savings were substantial on their trip to warrant it, but I do agree, some of the schedules (especially returning) are not most convenient