When you run your business (or in this case event) on someone else's network/app/system you're subject to the whims of the owner. You're sharecropping.
FWIW 44Con[1] used Eventbrite[2] (which I'd say is better for one-off events) for the first two years. Eventbrite check-in is awesome, but it's not perfect. This year we're switching to a system we've developed internally and using Eventbrite only for check-in. It's not that Eventbrite isn't good enough, more to do with integration issues, multiple events with different needs and the fees involved to do it all in eventbrite.
I'd still recommend eventbrite for someone wanting to run a one-off event though.
FWIW 44Con[1] used Eventbrite[2] (which I'd say is better for one-off events) for the first two years. Eventbrite check-in is awesome, but it's not perfect. This year we're switching to a system we've developed internally and using Eventbrite only for check-in. It's not that Eventbrite isn't good enough, more to do with integration issues, multiple events with different needs and the fees involved to do it all in eventbrite.
I'd still recommend eventbrite for someone wanting to run a one-off event though.
[1] - http://44con.com
[2] - http://www.eventbrite.com