That's the one thing that I love about it.
It reduces onboarding process for the user as simple as typing in the secret. One of the pet peeves I had with most of P2P file synchronization services were that they required registration with the central server. It's much easier directing my peer installing software, then typing in secret instead of "install the software, now go to their website and register, wait for E-mail confirmation, and then confirm your E-mail...what? You can't remember the password you have set?"
Their Windows installer even provides an opportunity to type in the secret right after installation, which makes the cases like above very easy to handle.