I like that you can do all your calculations without having to go back into excel or another program after completing them. The interface could use some work but nothing too major. If it's not something else already included then maybe have an option where you choose which method (if any) to run through with each calculation so there are no extra steps needed later when you want to change things up. We've been using this product since we started working here about 2 years ago now. It has come along way from just calculating averages.