The ease of use, functionality, customer service and support are all great things about Attendize. I've been using it for over 4 years now and haven't had any issues with our events being hosted online or tickets not syncing to our mobile devices when we're out in-person at an event. It's always improving as well - they just released some new features this year which was very exciting! Nothing really.
We have used other companies before but never found one that has worked so seamlessly together