HMA worked exactly as promised. Once you sign up, you can open a window which can stay open while you connect or disconnect the vpn as you wish. When in Europe, I use one service which lets me do more if it knows I am in Europe (so the vpn should be off) and another which only works if it thinks I am in the US (so the vpn should be on). It takes seconds to turn it on or off as required. Great product!