Summary: Beware!!! Not Mac OSX 10.10 (Yosemite) Compatible Kingston say they have new firmware in the works. Only time will tell. I will revise and/or return this before the 30-day return policy is up if no update is ready.
Excerpt: If the flash drive was not properly deactivated or ejected, you're locked out of the flash drive; meaning your password will not work. The only way to reset the password is to erase the contents of the flash drive. I recommend two sets of backup on separate flash drive to avoid losing your valuable data.
Summary: Tried the drive last week. It's definitely amongst the most pleasing flash drives I used. I'm surprised flash drives evoke that kind of emotion, actually. Overall - a very pleasing experience that I have detailed in an in-depth review here - http://goo.gl/rVcA6y