So I wasn't sure what to expect but after 1 day of playing with it I already have set myself up to save hours of work - especially following up on past due accounts which I hate doing...

I will probably be around the 8 to 10 invoice/mo range right now... if I go over the 20 invoices a year from now can I still upgrade to Black plan at the $24/mo price? How long do I have to upgrade?