Shuttle/bus reviews?

Hello!

Has anyone had any particularly good or bad experiences with any shuttle companies? I'm looking to rent a couple of 55 passenger coach buses to shuttle guests to/from the hotel and venue, but am having a hard time figuring out which company to go with, as there aren't many reviews. It seems a lot of the limo companies with good reviews don't have buses that size so I've been looking at a bunch of companies including some limo companies and some bus rental companies I've just found online. I just want to make sure I use a company that will actually show up! :)

Thanks!