Hi Andrey,

The javascript bug seems weird. I'm using FF3 without problem. The error seems to indicate that the javascript file isn't being loaded. Can you confirm that you have it in the uc_cim directory? Is there something about the path of your site that's messing up the include perhaps?

As for reasons to use the standard Ubercart Payment & Billing panes instead of the Payment Information pane, I'd revise your list a bit:

Payment Information:
Pros: Save credit card info Use previously saved credit card info (both systems will save it)
Cons: Must process refunds through Authorize.net (with either pane, you can process the refund through UC or Anet), Address fields not required (minor)

Payment & Billing:
Pros: Can process refunds from within Ubercart (both can do this), Can use other Ubercart payment methods with it (though this has the potential to create problems with recurring payments, so it's not recommended in most cases!), these are the standard panes so you can drop in uc_cim without changing the user interface
Cons: Customers have to enter their CC info every time.

In general, I would recommend the Payment Information pane - it's one of the main reasons for using this module and more tested. But I wanted to module to support the standard Ubercart interface so that it would work with any other core or contrib module, so I think it's important to support that option.

Best,
Chad