The signup process was interesting. Download the app, enter some personal info, scan the QR code on their site. Cool.
After logging in I got bogged down in trying to understand their stupid point system. Invite blah,blah,blah and get so many points so you can 'unlock' a website to log into. Huh?
Worse, it kept composing a self promoting tweet each time I logged into Twitter which required me to click on a small x to close it. Lame.
Great idea. Decent start at getting me to sign up. Not so great at converting me to use it full time.