Easy to set up, easy to use. It's very fast and reliable. Not much to dislike about it! I like that you can easily add modules or plug in your own applications (like XAMPP) so you don't have to spend money for expensive hosting services when you're just getting started with this kind of stuff. Nothing really at all! Just get yourself some time using this product first before deciding if you want to switch over from Apache/Nginx. We've been able to host multiple websites on one machine without having to worry about performance or downtime issues. This has allowed us to focus more heavily on our application development.