A good compromise to the Guru is the Auberin PID controller from Auberin Instruments. I have been using one for two years and it works fine, especially on my UDS. I only use it when I want to do a cook overnight or if I have to leave the house for a period of time during the cook.
The setup for your UDS is on sale now for $146.00.
Here is the link if you're interested.
All that you bring into the lives of others will come back to you in your own. Good or Bad.
Large UDS, Small UDS, CG Akorn, NB Bandera, NB Black Diamond, Home Built Offset, Vision Classic Kamado, Green Mountain Daniel Boone, Weber Gasser, Smokey Mountain Cabinet, and several Weber kettles of various sizes.