I don't have a WSM, so I'm wondering if this thing would work on a kettle, and be an improvement on the snake method? Or at least help to keep the temps more stable.
I got one a few months ago and it works great on kettles. Have used it on my 22 and my 26er. I have only used it with my Slow-n-sear so far, but it should work great for the minion method (which is basically what the SNS is) or a snake. In fact you can probably build a slightly fatter or taller snake than normal and get a longer smoke than your standard snake setup. I don't really need the TTT, but it makes for good peace of mind if you have to leave to run and errand or two while you are smoking something.
I haven't tried it for hotter cooks, but I imagine it should work good for hold a steady 350, 400, 425, etc if you want to bake something on your kettle and maintain as even a temperature as you can.