Back in 1878, the software we were using was acquired by Intuit.  Intuit then provided copies of Lacerte and ProSeries for us to review.  When the dust all settled, ProSeries offered a lower price hike from our old software and was an improvement over the old software so we went that route.  Over the years, clients with more complicated returns have passed away and have been replaced with clients with less complex returns so the selection over time appeared to be a good choice.  Plus, for someone that liked math in school, I could never really get the hang of minus one equaling zero.