MK 7.5 GTI DSG Towbar pros and cons

[glee]

I collected my new GTI DSG in November, and cancelled the fitting of the towbar by the dealer before delivery. I got cold feet at them tampering with the pristine bodywork and electronics. Also I wanted to research whether there is any significant adverse affect on the handling (when not towing or carrying a bike rack), or the parking and warning sensors/radar etc.
Any thoughts would be appreciated!