define not many people know how to use it...
Most people don't use it but its nothing but a google away, plus i find a vz dump an easy way to boot your os in single user and own your data.
As far as using amazon encryption set is a half and half deal. It is most likely secure but with them handling over 99 percent of it makes me worried, I would see if the source for it is open and tested to not have easy openings, Nothing beats a good encryption on your local machine done by you with the keys you choose as far as security in that sense. ( Dont write your key on a sticky note and hide it under your keyboard )