The J8 Fletching Jig by Martin Archery costs about 1/2 the cost of the Bitzenberger, and actually does some things better than the Bitzenberger. Both are available from 3 Rivers, and probably other places as well.
The Martin has an adjustment so you can set the feather angle more precisely than you can on the Bitzenberger. The Martin is made out of a type of plastic that sheds glue better than the Bitzenberger. You'll probably want to mount the Martin on a piece of plywood or something, which isn't a big deal. The Bitzenberger is heavy enough to use without mounting on anything.
The Bitzenberger is more solid and probably a little easier to use.
I wouldn't say that either one produces a more consistent fletch than the other. I think you get slightly more helical twist out of a Bitzenberger clamp.
The hardest thing with either one is the initial setup to get the maximum offset possible on your arrow shaft without having the feather quill hanging off the shaft. This varies, depending on the diameter of your arrow shaft, so the setting sometimes has to be readjusted when you go from a very small diameter carbon shaft to a larger diameter aluminum or wood shaft.