The headquarters is in Austria. It traces it's lineage back to Kanken Toyama via Isao Ichikawa(?), so its pretty diverse. Lots of kata too. A lot of them are the same as Shudokan given that they are so closely related. I met two practicioners a couple years ago from Vienna and they were fantastic.
If you've never seen Doshinkan or Shudokan, I'd probably say they look a lot like Shito ryu in execution. Just my opinion... I'm no expert, but I've studied Shudokan for a little over 4 years now and I love it. If you've got a competent teacher, I'd say that Doshinkan has a lot of depth to it. Best of luck.
I hope that after I die, people will say of me: "That guy sure owed me a lot of money."-Jack Handey