I have not tried that devil product so cannot comment on that. I did buy the GDE and am very satisfied with the product and the service. I tow frequently...long trips... max out around 9600 lb total weight (small trailer). I can pass most any body going uphill that is also towing..... its awesome.
2007 WK CRD, Quadradrive II, OEM Tow Hitch, GDE EcoTune, DPF-Delete, 4xGuard Front, Rear, Belly Guards, Side Rails & Full Matrix, OEM Skids, EHM, Dash Duck.