The most useful features are Load Balancing with SSL certificates (works great), ability to deploy different versions at once for test purposes without having too many environments which can slow things down. It's not easy as other tools out there but it has some very good options so I would recommend trying if you're serious about security! We use this tool mainly because we have thousands or users all over our network who need access from various locations/devices such as mobile devices etc.. This makes sure they always get where ever their needed by providing them an IP address range instead using static addresses like 192-168.-1.*.