Very useful

This is the best upgrade you can get yourself from that one Note you keep on iCloud which is not encrypted and stuff.

This makes it easy - you remember your main password and all the rest is available to you. It helps you secure all your accounts by allowing you to have truly unique random passwords for every single service you use. It is of course a huge problem if youre out and about and your phone is dead, but oh well :P

zBen about 1Password - Password Manager and Secure Wallet