I pay the annual rate. I open eFax, Faxes, Sent Faxes, and see Completed with the date/time/# pages/etc. immediately. I don't send very many faxes and am happy with eFax. I do have it set to email me a copy of Sent faxes for convenience.
I will admit, though, that I also have an old fax/all-in-one machine (gift from a client who upgraded) on an AT&T/Frontier line. When we moved to Optimum years ago, we kept one AT&T line for power outages. We could plug an old telephone into the AT&T jack when we lost power and our cable services (phone/internet/TV) from Optimum. That $11/month plain vanilla line kept us in communication during power outages (we live in the boonies). Now, we have a generator so don't lose power, Optimum has gotten more reliable with generators around our area keeping Optimum services up and running, we all have cell phones, and that AT&T/Frontier line is now up to $23/month plus long distance. I'm tempted to drop Frontier, but the fax machine still is handy for documents that are not in my computer. I guess that's one of the decisions I'm making before tax season.