It's better to have them email them to you because you get the ticket right then and there and you know, right away, that you've gotten it. Furthermore, it saves you a lot of trouble if you lose your printout, because you can make copies and save the PDF they send you. Finally, ticketmaster sends tickets out in unmarked envelopes, which is okay, that do not have a return address on them, which means that should something go wrong and the mail gets lost, neither you nor them can prove it until right before the show and you have to do will-call.
I ordered my tickets to ProgPower 5, had them sent by post, and NEVER GOT THEM. Repeated calls & emails to ticketmaster and Glenn, who was very helpful, finally resulted in being able to do will-call, which worked out but was total bullshit considering they should have done what they were supposed to and mail out the tickets. It was a tense summer not knowing ultimately if i'd be able to actually get into a show I paid over a hundred bucks for. The fact that it worked out in the end doesn't redeem Ticketfascist in the slightest.
So this year I decided to do ticketfast, because I did it recently for Gigantour and it worked BEAUTIFULLY. Now, of course, you can add me to the list of people who did NOT get their tickets emailed to them. I've had 3 attempts with 2 email addresses across 3 days so far. I guess I'll have to do what the others have done: call them and tell them to post-mail the ticket. I'm convinced the people at Ticketmaster just sit around thinking up ways to screw the customer, knowing the customer has no choice but to commit themselves to weeks of struggling to get a simple product they paid for.
Any aspiring businessmen around here who are looking for a field that will allow them to supply a considerable demand: try and start a ticket-service company (that works)! Anybody who does this will immediately get more business than they can shake a stick at simply by virtue of NOT being Ticketmaster, who are to music what Microsoft are to computers.