I like that it's an online program with access from anywhere via computer or phone.
It has many features but also allows you some flexibility in creating your own reports if needed (if there isn't one already available). The user interface could be improved as well - sometimes things are hard/slowly loading when trying click through menus etc., so this may not bother others who use other programs better though! This was our first go-round using Nutrialysis; we were able to create several different types of charts showing various nutrients over time vs food groups which helped us see what changes occurred during my clients' pregnancies & postpartum periods compared between their diets before pregnancy versus after delivery.