I would encourage you to look around before deciding on Pulley. While I haven't used them in a while, when I did I was really blown away by how little support, features, and service they provided. It felt very half-assed and very slow to grow. I emailed them once about something and they seemed annoyed that I'd have a feature request. I left immediately after that, and that's when I went to Gumroad. Been happy there since. However, should I launch something new, I'll definitely look at SendOwl