The ease of use, especially with younger cattle (4-6 month olds). I can see how far out my cows are from freshening by clicking their ear tag to update when they enter in or exit cowyards via an audio callout that plays anytime someone enters/leaves those areas which makes it quick easy for everyone at our ranch! Nothing so much as yet but we do have some questions about being able to track individual calves over time - does not currently work well enough? We need more automation than this program provides right now because we raise several different breeds all year around including multiple bull calf crops each season along wtih 2 other farms nearby us plus milking herd here too; thus needing lots AND LOTS OF HELP FROM THE TEAM. ! It's worth giving though if you're willing tto put forth effort since there aren't many programs like ours available otherwise where people actually farm livestock instead of just running CowSense is great for the price. There is nothing I do not like about the program. It is very user friendly. I have heard some people say that the app is not as reliable when it comes to the herd health part of the program. That is not my experience at all. I think the program is very user friendly and is a great tool to use. I am monitoring all my cows and knowing what they are doing and where they are. I can also use the app to check in on my heifers and make sure they are doing well.