The ease of use for all parties involved in my project was one thing I liked best about Radar! It's easy enough so you don't need training or experience with it but still allows people who are not familiar at using technology an opportunity as well (like myself).
Also their customer service team has been great throughout this process too!! Nothing really dislike other than maybe some minor bugs here & there which could easily be fixed if they were aware by our customers/users though we have never had any issues ourselves since launch day last year. We've used radar primarily because its very user friendly compared most others out therse including Trimble etc.. And also how much easier everything can get done within such little timeframes when working remotely from home sometimes up until 2am everyday due to lack off sleep haha :P.