I've got one - although they were marked as a Voere 2000 in NZ (Kleinguenther was the US importer, I believe). I bought the only one I've ever seen, and it was probably the best rifle purchase I've made.
As others have said - VERY high quality. Twin front lugs, locking into a stellite (cobalt-chromium) receiver insert. Low-lift bolt, fully adjustable trigger, pillar bedded (I bedded mine, but if it's Kleinguenther marked it's probably already been done.)
I also own an Anschutz 54 to compare it to, and I'd take the Kleinguenther over the Anschutz. It's lighter and better balanced while still being solid. There are a couple of foibles to be aware of, however:
1) Ejection can be a bit weak - but a slight bend to the extractor claws fixed that.
2) As mentioned, it's hard to get access to the breech for single shot feeding. If this is important to you, you can always make up a single shot adaptor as I did.
Here's mine, including the bedding and single shot adaptor.
Rimfirecentral thread Mine is a sporting rifle with a sporting scope, and a sporting (not target) shooter behind the butt. Even I managed 4 successive 5 shot groups averaging less than 5mm centre to centre - with mid-priced target ammo (25m).
I really hope you snapped it up - please post photo's if you did.