I am in the camp of if you are going to go with roller.at make sure you can get rollerat.com! This actually is pretty easy since it seems like a weird URL, but

I am in the camp of if you are going to go with roller.at make sure you can get rollerat.com! This actually is pretty easy since it seems like a weird URL, but makes sense once you start talking about your product, "visit us at roller dot at" and people will still go to rollerat.com. Redirect rollerat.com to roller.at and be done with it. It just takes a little extra time to make sure you can get both domains.