Bought one GS Adv from them last year, and it seemed to spend most of its life getting fixed.
Usual problem was they book it in, order parts , but not check what had parts arrived until day of appointment, ie tank wasnt an adv one just an unpainted blank, Next time fork bridge swap, R1150R one turned up... stupid stuff, also they jet washed off my rear stickers..
Worst of all, swapped rear swing arm and brake hose under recall and I suspect either fooked the rear hub bearing or failed to spot they were goosed (10K miles). just prior to a trip to spain, I got back and a.n.other garage pointed the 3mm play in rear.... wunnered why it felt edgy at speed, I'd put down to panniers an top box upsetting bike. Either way , its all show an little go.
PS the courtesy bikes are always running on vapours when picked up... wheres the courtesy in that, one had flat front tyre too.