I bought a detachable towbar for our A6 avant and got @pobmk4to fit it. Would probably have been around half of that price all in.
I considered it, but if I'm spending £20k on the car..I want the right towbar, and right for a lazy git. And with having a detachable on my Volvo, even if it is simple to fit etc, it's also a PITA carrying it around in the boot. For sake of a few hundred extra, the electric one is just worth it.