My one experience with Flo, many years ago, wasn't good. I signed up for a month so I could watch one event (my old high school was in the Clash). It took forever to find out how to cancel my subscription. I gave all of the appropriate notices (multiple times), but they charged my credit card again anyway. The only way I got out of the subscription was by going to my credit card company and disputing the charges. Once they realized they weren't going to get paid, they let me go. I've never gone back, even though there were a handful of events I was interested in seeing.
My high school coach also had similar issues with them at the same time.