I looked at the Guru, I looked at the stoker, and I found the stoker to be a much more versatile unit, not only for the available temperature ranges, but the accessory uses too. One stoker can run 1 piece of equipment or 30 pieces of equipment at the same time, using different temperatures on each cooker. They really are neat.
Then with the addition of free PC based aftermarket software, I can monitor and change my cooker temps from anywhere in the world that I have Internet access when using my stoker, and I like that I can log my temperatures in graph formation and be able to save those graphs for insurance purposes (commercial use).
I even have alarms that I use to send me a text message if someone opens the cooker door.
If you have not tried a stoker yet, take a better look, it may just fit your unique needs better than the guru is capable of..
I am not affiliated with the stoker, or its software in any way, nor do i profit from people using them, I just love mine due to it's flexibility compared to other draft controllers available.