No charge backs. People will quickly realise this often quoted advantage of bitcoin over other electronic forms of payment is only an advantage for the merchant, and never for the customer if BFL should go bust. What's more, as bitcoins sit squarely outside the traditional banking system it's going to be difficult and costly trying to get any back through the court system.
I honestly have no idea if I'll ever get my mid 2012 order shipped. At the moment I'd put the odds at 50/50 at best, with a daily decline. BFL has to be burning through large chunks of money to keep employees on site and pay the rent. Every time they ask for a PCB revision or another batch of test chips I shudder at the thought of how much all of this is costing.
Not everyone paid with bitcoin though. I think it was bitcoin-only for the very early orders, but certainly by Sept or Oct, credit cards through paypal were an option. And I don't see anyone would pay by bitcoin if paypal/credit card was an option.