I have been doing this for about as long as anyone on this site.  I have never had a client want the government to debit their account.  I have clients from age 16 to 99 and they all seem to have no problem taking home the voucher, writing a check, and then mailing it.  Guess I must be lucky to have a smart group of clients that don't consider writing check and putting a stamp on the envelope that I give them a difficult task or inconvenience.  Consider me lucky.