Very simple to use, just install and in the toolbar icon click start. done. No registration. Just like using a proxy addon.

Speed is ok. Its about 50% slower than normal but since I only need it rarely for a quick use, its ok. For extended use its better to use something like vpngate (its not a firefox addon, it enables vpn for your full computer, its free).

I tried Hoxx, SetupVPN & ZenMate, they all require you to register.