I have been using the Arizona EZ fletch with great sucess. It may not be a Bitzenburger, but it still gets the job done. I like the fact that I can do all three fletchings in on shot, or just one or two if need be. You can get it in straight (1 degree offset), 4 degree and 8 degree acording to the website. Here's the link...
http://www.ezfletch.com/
You can interchange the arms to suit your liking which is nice, but it can be a bit of a pain to do it. Mine is an older style though, and it may be easier on the newer style. Over all its a great little tool, and I'm very happy I got it over a more expensive one.