My setup is a Macbook Pro running the latest version of Lion, after a few months of use it failed - I started up my mac, and it hung on the grey apple logo startup screen. Turned it off and tried again, this time it hung for a few seconds before automatically turning itself off.
Booting from a backup drive, I was able to see all my files on the SDD, but it reported an error when mounting, with OSX recommending I take important file off it and reformat it. I did this, spent yes reinstalling everything and 3 days later starting up from the SSD - error - it again hung on the grey apple startup screen until automatically turning off my mac. Same problem again.
Disk utility reports it as an Invalid Node Structure. I've now searched on the internet and found other people with this drive reporting this serious problem on forums, and recently so too. No solution or comment has been put forward by Kingston or Apple. It seems to be specific to this SSD and Lion. Perhaps something to do with Lion saving files as it shuts down, or perhaps due to insufficient power for the SSD on shutdown.
I will try to return the SSD and perhaps go back to a normal disk drive or try another brand of SSD.
Avoid it if you use a Mac and Lion!