Hotspot Shield and VyprVPN are two providers that offer unique proprietary features to enhance security and user experience. VyprVPN adds an extra layer of security with its Chameleon feature – a tactic to defeat VPN-blocking by scrambling OpenVPN packet metadata. Meanwhile, Hotspot Shield uses Catapult Hydra, their own transport protocol based on the SSL library to speed up their service. Hotspot Shield is the cheaper of the two premium packages and offers a 45-day money-back guarantee. Meanwhile, VyprVPN offers a 30-day money-back guarantee. Both Hotspot Shield and VyprVPN offer 5 simultaneous connections to share across devices and have applications for all major computer and smartphone platforms.