The quarterly fee is $8.99, and is charged by VISA/MasterCard and is not a fee by CellCharge itself.
We use CellCharge, we do use the imprinter (so far haven't had very many "over the phone" sales- just one for a GC last year), and I quip that it's "old fashioned", but it saves in overhead while allowing us to offer the convenience of using a cc to our clients, and I also let them know that we shred our imprint receipts after everything's gone through so we don't keep their cc info (I make note of the authorization codes prior to shredding, of course.). So far, everyone has responded well to this approach. One client even actually TAUGHT me how to use the imprinter (hubby had previously been the one to use it)!