Survey for ticketing system

Have you used ticketing system for your events?

if yes,what system have you used?if no,what would expect of the ticketing system?

if yes,why did you use it?

Did you encounter any problems while using it?

if have any problems,please list it?

If 'No', maybe not in creating, but in issuing or checking on event day, did you encounter any problems?)

What is your opinion on the most practical ticketing system?