I'm a little late to this discussion, but here's the blog post I did for Intuit about why i switched from ATX to Lacerte:
https://blog.accountants.intuit.com/?p=23325
My three big takeaways discussed were (1) after the ATX experience this tax season, people in my office were happy to switch, (2) the Lacerte training time (free training!) was quicker than ATX customer service hold times, and (3) if I count any of the indirect costs of using ATX, Lacerte wasn't any more expensive.
BTW, we switched mid-tax-season as noted at the myatx forum (I see many familiar names here)... and I also need to say here that when I got my Lacerte invoice (and looked at the big number it shows) my only reaction, my only reaction, was to think, "Gee I am happy to have good tax software."