For those people reading some of the comments above, giving rise to concerns, please read this...
The Foundation are fully aware of USB problems (and HAVE acknowledged them) and are working hard to fix them. We have access to code and documentation not available to the general public, which has already resulting in major improvements to the USB software. Many people won't even see the issues even before the fixes, but the current state means problems are now much rarer.
The Foundation were NOT aware of these problems prior to releasing the board. Of course, it was tested, but there are limits to how much testing a non-profit charity is able to do. This is why the board was released as a 'beta', using the people who bought it as testers, finding faults, and giving the time for the FOundation and others to fix any issues prior to a full blown education release later this year.
If HW problems come to light, then future board revisions will include them. For example, the polyfuse issues, and a minor issue with the LAN controller power. Neither of these issues mean the current board is bad (in fact, its pretty good for a first revision!), it just means any future revisions will be even better. This is common practice in many in industries - incremental improvements are made to product during its lifecycle.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Contrary to popular belief, humorous signatures are allowed. Here's an example...
“I own the world’s worst thesaurus. Not only is it awful, it’s awful."