I have used PTO, but only to see how it works and try to help on the forum. I have NEVER PURCHASED a return from PTO. I appreciate the fact you can fully use the return and not pay unless you print or e-file the return. I has a large similarity to Lacerte. Totally different from ProSeries. It is clunkier than Lacerte, but it is based on Lacerte. It has improved tremendously since it started. It has a decent search feature. It has a jump to input feature from the forms. The organizer is new and apparently needs much work.  The ASK PTO https://accountants.intuit.com/support/tax/online/index.jsp?taxpro=true   needs some attention, but it can be helpful. I can see that if you are only looking at cost and your practice size has shrunk, PTO could be for you. 

It would be nice if @mdkappy1 would come back with findings.