I was going to go this route, but the after market hitches really look like a bad bolt on accessory (in my humble opinion). If you go to etrailer.com, you will be able to see several hitches that will fit the Q5. they hang much lower the the rear defuser and look out of place to me.
I usually go with an after market hitch from etrailer.com, but I just couldn't do it this time. It was a painful $1300 to have the factory hitch installed knowing I could have gone after market with a self install for about $225 (w/no wiring kit).
This is my dilemma now too. I need a hitch for bikes and the OEM is the best, but crazy expensive option. However, the look of the aftermarket options is awful. I wonder if I could get something fabbed/installed for like $500.