Darn, and it was working so well until I did a power off/on. I did a reset before and it seemed to work fine...
It's been sitting spinning on the startup screen for a several minutes now...
Everyone who's having problems should contact Anand Shimpi from anandtech.com (via Twitter or e-mail).
He's currently working on his MBP-review, stress-testing the 510 and other SSDs, and he's very interested in these issues.
Can you contact him? perhaps you could give him a link to this thread