IMHO, Never keep your currency in any exchange, use the exchange, then secure said exchange off line. I looked into the Vault of Satoshi, the services they provide are expensive, they want ID (Government ID) and all that info you give them is held by them on their servers. That is not secure, that in fact make you a potential target for the Government as they could seize those servers and all the info they contain.
Printed copy · Anthology Volume 7, page 426Printed copy from The Tender For Law Anthology, Volume 7, page 426 (printed 13 June 2014). Added by this site; not part of the Facebook export.