I use the ROS and file VAT, PAYE, PRSI etc. It's an easy service to use, and I don't have to deal with hardcopys. I don't get anything in the post, don't have to manually fill out forms, in addition, receipts of return and receipts of payment are downloaded onto my machine with specific transaction details.
I use it and it's a well designed, easy to use, well supported system for regular uses such as PAYE,VAT etc.
I don't use it for once off annual tax returns as I reckon that it's quicker filling in the forms and not having to learn how to use those aspects of the system the first time, and then having to relearn them on subsequent years.
Yep, I use it also for everything, the paper in the office has gone significantly down! I do use it for annual returns also and find it fairly foolproof - maybe you might want to take another look brendan?