I am currently working at STN for easyjet product and since the introduction of the internet check in it has had mixed result, to be honest theres been no real difference at check in as yet but maybe might change as people become more aware but too many times the pax are sent back from security were the inet boarding pass is scanned and computer fails to read the barcode.
if the scanner failed to read the barcode on the boarding pass would ryanair then ask for the £13.50 for a new boarding pass however knowing ryanair probably a silly question.