Anyone changed standard temp contols to limited temp controls?

[machinewars]

I've always wanted the temp controls which allow a certain temp to be set and the temp stay that temp such as the limited models have. I have the standard knobs and was wondering if anyone has made the switch to limited controls and if so how much was the upgrade and was it easy?

[07DCwhiteSR5]

do a search been discussed many times. expensive but can be done. not really worth it though.