Well I finally got around to fitting the Wunderlich hugger.
Instructions were clear, everything you need to fit it is included.
The fact it uses the original BMW chain guard is a bonus IMO.
You can remove the chain guard for cleaning and maintenance without disturbing the rear hugger.
It fitted first time with no need for any sort of adjustment, and while it is not the cheapest out there, it is certainly worth the money.
This is the first bike I have used Wunderlich for parts and accessories and so far have been very impressed with all their stuff.