Lastpass is a bucket of ass.

They've had security bugs in their browser extension before, but it is almost required to use it - the webapp works horribly without it. My least-used browser gets that extension, so it isn't running most of the time, at least. And with it, the UI is still terrible. The app is just awkward and poorly done.

The one good thing I can say is the user/group model is reasonably implemented.