This is basically an anonymizing middle box that provides physical isolation of Tor, the strongest protection available. It definitely looks promising, but have you read the setup instructions? It isn't a preconfigured device. You will have to install Debian (technically a spin called Raspbian) and Tor, and manually setup iptables rules. If you are ready to do that, then go for it and let us know how it works. Keep in mind that there are many ways to deanonymize yourself besides IP leaks. You should still use the browser bundle with the transparent proxy settings.