I like how it shows you everything about your cows in one place! It's easy to use with lotsa features so there are no issues at this point yet (but we have only been using 3 weeks).
The interface could be better but not much can really change without having more developers work into making improvements or new versions available which would cost money/resources - just my opinion though as others may feel differently than me :) We love being able see what our animals eat & drink every day plus when they're sick etc., also where their udder health status stands each week compared against last time checked makes monitoring progress easier too!!