I have used ESUN PETG for a while. Best settings on my PowerSpec Ultra 3D printer with all-metal extruders, BuildTak, and Simplify3D:

Extruder Temp: 230
Heated Bed Temp: 80
Infill: 50% (100% for gears) (Poor bridging below 50%)
Outline Overlap: 25%
Cooling fan on after layer 2
Printing Speed: 60 mm/s