The user interface has many customization options that are easy enough for even new users with no programming experience or math background at all! It's not as robust in terms of calculations/features compared against other software like Excel but it works well nonetheless (it can be used without any modification).
Planning projects within my team was very useful because I could easily see what tasks we were working towards each month instead of having multiple spreadsheets tracking our progress which would make updating difficult if things went wrong during execution time-wise etc..