Has anyone on here used Gamefly to rent games??

[dave4shmups]

I've been watching coverage of E3 on G4 TV, and I've seen the "free trial offer" for Gamefly.

Is the trial offer really free?? Because right now, I don't want to subscribe, I just want to use the "Free Trial Offer" to try out a few PS2 games. But I need to know if it's completely free-ie, do I have to cover shipping to send these games back to Gamefly?