We have been using Simplicity for about two years now across multiple departments within our organisation - we've deployed four apps so far (two frontend + two back end). They support all major browsers (IE7+, Firefox, Chrome, Safari), mobile devices etc., they're really easy to use, no hassle at all when it comes to configuring things. The only thing that might be considered negative would be their pricing structure which seems quite expensive if you compare it to other platforms out there. However, this isn't something that has stopped us from moving forward since this doesn't present any issues right now. Support is great, quick response times. Nothing much that needs mentioning here! Our current app uses AngularJS 1x & Bootstrap 3x. The best part about this product was that it helped us automate our development process by providing all required tools for creating apps from scratch without any coding knowledge at first time itself! It can be used only if you have some basic programming skills otherwise will not work well but its good enough tool which helps me develop new features very fastly within few days instead waiting months before starting my project!