Best app for commercial use

I installed and reinstalled this app throughout past years a few times, mainly to sync issues. But I always fell back, due to its abilities and design catering to the professional user. No other calendar app could satisfy our needs as well as pocket informant. With the outlook of a MAC app pi will close the circle, we are looking forward to that.

RC3hkr about Informant - Agenda, Tasks, Notes Planner, v4.61