I strongly recommend users who access business data while traveling or in other public spaces/wifi to use a VPN. Sometimes that means a VPN to their internal systems, which is fine, but as more services move to the cloud it's important that users are on a VPN for additional security. Especially on "open" wifi access at hotels/coffee shops, having a VPN is critical.
Golden Frog VyprVPN is a great tool, and I've used it on OS X and iOS so far. It's my #2 VPN of choice right now. The Chameleon feature, which allows you to get around some firewalls, works awesome, but is unfortunately only available on OS X right now, not iOS. They also only support IKEv2 (not OpenDNS) on iOS. That, combined with the Trusted Wifi networks which seemingly just doesn't work, causes it to be my #2 VPN of choice. However, I still keep it and subscribe, both as a backup and for the Chameleon feature, especially on my computer.