The best thing about this system it's all in one place! It allows me as an event coordinator for large events suchas weddings or corporate functions (or even small ones)to keep track of my clients information & their guests so I can make sure everything runs smoothly once we start planning/booking our big day(s). This saves us time because there are no other systems out here like TP where i have found myself needing multiple apps just be able find what info was needed at any given moment during setup etc.. Nothing really but if u're looking into having only 1 app then give them some serious thought before signing up!! We use total party planner mostly when booking wedding plans which includes guest lists plus managing vendors who provide services including caterers ect... I like how easy it was for me as an owner of my own party planning firm in Toronto Canada! It's very user friendly!! The only thing i dislike about this app so far are some glitches but they seem fixable soon enough once we understand what exactly needs fixing or updating.. This application has made our life easier by providing us all these tools at one place which makes managing events much simpler than before when each event would be managed separately through emails/calendars etc.