My main complaint with ProSystem is how do you find anything? Either you work off of the archaic input sheet view - 1099SSA is in M-1 - 8606 is in T-1 or you use a more intuit screen, somewhat like Lacerte, but 1095 A, B and C are in different screens. Right click and "jump to input" gives you many choices and when you pick one it gets you into the general vicinity of the input. I guess I am just too old to learn new ways. There were bugs at the beginning, but they seemed to resolve fairly quickly. The 15th seemed to go smooth with Lacerte & Prosystems, as far as my interaction was concerned.
38 years with Lacerte = Old Dog vs New Tricks.