Mate it was shambolic, couldn’t handle the traffic, I’ve been to hundred of concerts and festivals over the last 15 years, I managed to get tickets for Black Sabbaths come back gig in 2012 in a tiny venue, Foo Fighters at a smaller than normal venue etc etc and never once have I had a ticket system allow me to put a ticket in my basket, send me to the payment pay, allow me x amount of minutes to fill in my personal & payment details, then tell me no ticket is available.
So yes, when it comes to handling a lot of traffic, it is crap.