Sorry you had a bad experience with Clive's. I use them often and never had a problem - and I travel solo so it's a cheaper trip ($25) but they still have been reliable. Last time I had to make a last minute change, requested a 4am pickup on Christmas eve and I was well off the beaten trail up in the countryside - they were there on time. But no matter who you use, it is a good idea to follow up with a confirmation/reminder call the night before and even the day of travel.

Another option at the airport is the JUTA - round trips are cheaper and they are generally reliable. But sometimes you have to wait for the bus to fill up before you get on your way from the airport.