Their "guaranteed delivery by the event" is not enforced for their sellers in a reasonable way. I purchased tickets 6 MONTHS in advance and had the absolute PANIC of having them delivered 13 minutes before my event began, as the doors were closing. I planned a whole trip to NYC around this event and cannot describe the stress of having this happen. Customer service was responsive but helpless - it was all up to the "seller." I would NEVER use this service for anything important, or ever ever again.