I finally got my Blackberry Z10 few days a go and I want to inform you that I managed to connect my Z10 to VPN servers with Super VPN - PPTP and Open VPN Anonymous Web Surfing Services provider with which I got vpn account for more than 1 year. Configuration is pretty simple. All you need to do is to install their SSL certificates on your device than setup connect and connect with just one click. You can even setup auto-connect feature which is amazing new thing in Blackberry OS 10 .
Whole guide can be found here
How To Setup Blackberry VPN Plan On Blackberry Z10 / Q10 | Super VPN Support Blog
I prefer their service because they use 2 SSL certificates to encrypt whole connection which is much more secure than keyword encryption.
Z10 Rocks!