I checked Keilwerth's website now and see it is listed there but also says "This instrument is not available in the USA" so I guess this can be a reason why not many on the forum will know it.

 

I am from Germany and I've got the s.k.y. concert Tenor horn. It's o.k., very easy going, acceptable intonation (also depending on the mpc and reeds you are using...). I guess they are made in Taiwan. I payed 549 Euros for it. Playing on it is a pleasure, but the sound is not so "fat" like a Yamaha, Selmer or Keilwerth professional or semi professional instruments. For beginners it's better than the Selmer Prelude instruments (horrible intonation, difficult for a beginner to get an acceptable satisfying sound out of it), but the same price category. I can research further informations, I only read this question today, I stumbled into this forum...