Can I use Surcharge on Magento Enterprise?
Currently there is no officially supported Enterprise version. Other customers have successfully used the community edition with Magento Enterprise - it's just that this has not yet been fully tested by us, and any Enterprise specific features won't be supported.
Rest assured that our extensions include a 30 day money back guarantee, so feel free to test out the extension on your own development site. If it doesn't work as intended, just let us know and we will refund your purchase.