Glo-Bill is 'da best! I use them for all my sites now for years and after suffering through mongo screw-ups with iBill and Epoch I can say no one does it better than Glo-Bill.
I'm not one of the unlucky few that got one of them bounced checks. For those guys, I would say don't worry about it (Heh. easy for me to say). But seriously, if there were any problems Globill will correct it. They're not gonna stiff ya for $17 or whatever...