It all depends on the volume you send.
We looked into it at work and was too complicated, we are a small mail order company and they wanted us to send 500+ letters a day!
Some days we do but others we might only send half a dozen.
UK Mail had similar regs, we tried them and they are rubbish, only called when the driver could be bothered and im convinced they never sent the letters, as we got no response from a 5000 item mailshot we sent with them, not even a go away im on the MPS!
We stuck with Royal Mail, give them a call they have all sorts of new systems to save money!