I've had a Stoker for about a year now, and use it to control my Klose and my BGE. I chose it over the Guru for the network interface, which I have used frequently to monitor cooks from inside the house or when I have to run out during a cook. I use the stoker log software to track temperatures graphically during the cooks, and this has been very helpful to me in improving the repeatability of my cooking. (Disclaimer: I am an engineer, and I love technical stuff, so some of my satisfaction with the Stoker probably comes from the fact that it is so nerdy-cool. Nevertheless, I would highly recommend it.)
By the way, my experience with Rock's BBQ has been great. I had a blower go bad, and John replaced it right away, asking me to return the bad one once the new one arrived.