I like their service, its always up to date (even if it has not been released yet), easy access from different devices with no problems so far.
Also they have fast servers in lots countries such as USA, UK etc. Not all protocols are supported out-of-the box but you can easily add them via an addon or client apps that come with every server package! Price could be better for enterprise use cases where more users will need multiple connections at once time instead just few standard ones. We needed some additional features which were lacking compared to other providers - we wanted secure video calls using Cisco's SPA firewall technology integrated directly into our own private infrastructure platform; this requires advanced customization by experts who understand the product well.