The ease in which you get results, it is very user friendly! You don't need any special skills or experience for this software - anyone who has basic computer knowledge will be able use them without issue as well I have never had an account closed down by JSService so far (which other similar services do).
It's not perfect but we've been using only 2 years now with no issues at al yet!! We're looking into adding more features like video interviews etc soon though when time allows us some spare hours :) My team uses job serve every week if possible just because they love how easy its made our recruitment process much easier than before thanks too jsserved staff :D.