The user interface is very easy for any newbie or even an expert in this field! I have been using UViNIONICS since last 2 years as my primary source monitoring device during workouts at gymnasiums and home gyms along with other health related equipment such as heart rate monitors, blood pressure cuffs & weight scales. It has helped me monitor all these parameters while working out/training sessions without having anyone else around who can help me understand what's going wrong when something goes awry!! Nothing much so far but it seems that they're continuously improving their app which makes life easier by providing more features over time. For example- you used to be able to only track your calories burned per day - now there's also tracking done daily basis too! Very helpful especially if one wants to keep tabs on his.