Recommendations for Heat Regulators/Control systems?

Looking into getting a heat regulator/controller to install on snake racks. Would anyone please provide their recommendations and experiences with them? Much appreciated.

I personally would look at the herpstats myself, but the any proprtional unit will work I just like the herpstats. Some on off systems work well too but they have a lower accuracy than the proprtional units.

I have been using herpstats on my rack I have never had much variation in temps and the unit is solid. The one time I had an issue Dion was fantastic the tech support is awesome.