I have used their Google Checkout Level 2 payment module and would certainly NOT recommend it. The module is full of bugs and what is even worse, I had a bounced email last week after a Google checkout payment from
pip@magneticone.com, it turned out that they hard coded an email address in the mod and have received a copy of every order placed through my store. As the php files are encrypted I cannot see this code and they have provided me with an update, but I am not confident that they have removed this !