Should you be concerned about LastPass uploading your passwords to its server?

For example, whenever you access Account Settings you leave the trusted browser extension and access a web interface presented to you by the LastPass server, something that the extension tries to hide from you. LastPass data on the server is worthless on its own, but NSA might be able to pressure the company into sending a breach notification to this user. So far they didn’t make a serious effort to make the extension’s user interface self-contained, meaning that they keep asking you to trust their web server whenever you use LastPass.

Source: palant.de