I have the Maverick 733 and it works great. Only thing is I wish the probes were a little bit longer, but I set a small stool next to the WSM to set the base on.
I cant remember what I paid for it $50? and it came with a free set of bear claws to shred pulled pork from Amazon.
The Thermoworks Smoke wasn't available then, I want it now, but not sure it is any better than the Maverick 733.
Another thing to consider is the Smoke probes have that spring on the end of probe, I don't know how you route your probes, but will they fit your current set up