Hello,
very nice module (especially given the behaviour of the binaries in the ATOS pack
We used it on one of our client website and it performs quite well.
Here is our work on a little more integration, in case it can be helpful to anyone :

• management of the response directly in database and moving the order status to "payment received" (if it has been configured),
• if you're lucky, you may configure the ATOS part nearly entirely from Drupal interface,
• auto-response works and "replay" of a transaction is (usually) detected and dismissed,
• you can put the binary files quite anywhere within Drupal reach,
• extensive use of log,
• add support for Credit du Nord (webaffaires)

However, please read the doc and test carefully before going to production
Enjoy

note : it has been developed against an alpha version of ubercart. Please report any problem.
Files : patch against 1.2 and full package (INSTALL.txt not up to date), to your choice.