Looks great and is very useful.
I can get more out of my machine and more control due the temperature feedback.
It is easy to fit, smaller than it looked in pictures and looks great. It turns off automatically too which is good. I used the existing copper washer rather than a new one and I did have to do it up quite tight to prevent leaks but it is all good.
I can tell at a glance now wether my Wega Mini Nova Classic is warmed up and I can target a range of temperatures if I wish but I typically do pours at 93-94C and this requires a purge before each shot which is about five seconds after hissing stops. The Wega is very stable though.