The Monthly Plan plan by VyprVPN does have a VPN Client.
It does not have bandwith restrictions, and they don't keep your connection log. They also do have a mobile client and a Kill Switch feature is available.
This plan also comes with the following benefit(s):
Customer Support: 24/7 Customer Support
Server Locations: 200,000+ IP addresses, 700+ servers
Number of Connections: 3
VPN Protocol: PPTP, L2TP/IPsec, OpenVPN, Chameleon