This here. I am a sole prop, and just got my first part time assistant. I do, however, have a couple of returns that would work better on more advanced software, and having used ProFx & Lacerte at jobs in times past, I know what top line software is capable of doing. Since you mentioned in your blog about having 'CPAs and paraprofessionals' I'm wondering why you were using ATX to begin with, unless it was simply a holdover from when your firm was smaller. I'm doing about 300 returns now, and have not had many issues so far this year.