I couldn't justify the price for my HLT temperature, so I only have one Tower of Power controller on my March pump outlet. I use it for setting my strike temp, mashing, and also after my plate chiller to monitor the temp going into my carboys. The option of doing rests and mash out with the touch of a button is fantastic. I also plan on doing cheat decoctions where I use less volume of decoction and then ramp up to the next rest, so I don't over shoot my next rest. It does eliminate a tremendous amount of dicking around to hit and maintain mash temps. The only work for me is to hit my strike temp, check the recirculate flow for 1 gallon/ min, stir the mash ever 10 minutes, and to input a temp change. Since I don't have the Blichmann flow meter, I just eye ball it a minute after I stir. If you think this makes mashing easier you are absolutely correct.
My opinion is that this is the best innovation in brewing since the auto syphon and modern yeast!
Gary