The most helpful thing about this program that I can think of right now would be how simple it was to learn at first, as well as getting used with all its features in general! There isn't many things i disliked either; so definitely try out their free trial version or demo versions online if you're interested.
This product makes my whole office workflow much easier - from scheduling appointments through billing/subscription options etc., everything gets done very smoothly which saves me plenty time each month just being organized more efficiently than before (and also having less stress).