The cost for supplies for the new billing format is the same, although a little more labor is required to fold and stuff the bills.
Some of the perks of the new format include the fact that more people are using the right address to mail their payments, the bills are less likely to get stuck between the pages of other mail, and the format seems to be easier to read. There is even additional information included on the statement like what your previous balance was and when the last payment was made.
Late payment notices will no longer go out on postcards either. Those notices will also go out in a window envelope.
Don't hesitate to contact the office whenever you have questions about your bill.