I really like how easy it is to use, very intuitive! It's fairly inexpensive too so that makes me feel good about our decision making process as well :).
There are some minor aspects of its design which could be improved but they aren't game-breakers for us or anything - just an observation from someone who hasn’t designed any interfaces in over 15 years (myself included!) If you're not familiar with graphic user interface designs then this may prove difficult at first until your brain starts working again :) We have had great success using CSS3 media queries combined with responsive frameworks such as BootStrap 3.x / Foundation 4/5 & AngularJS 2+.