I have a Jo-Jan single & six arrow (which I'm probably going to put on the Classifieds one of these days), but the fletcher I use 90% of the time is my Arizona EZ Fletch.
I'll disagree with Rob D on this one. IMO, the Jo Jan is much more a PITA to work with than the EZ. Not only is the EZ easier, it's virtually idiot proof. Put a feather/vane in each arm, apply glue, and close it up. No sweat. With the Jo-Jan YOU have to position the feather/vane identically in the clamp for each one. If you are off in the slightest, you've screwed up that arrow. I also find fletching helical to be much more problematic with the Jo Jan, where it's automatic with the EZ.
Not sure what Rob means by "limiting". Both will do carbon or alums, feathers & vanes. Both require specific arms/clamp to fletch straight or helical. You can do offset with a straight clamp on a Jo-Jan, where with the EZ you need the offset arms. Makes no difference, as I only fletch helical, anyway.
In fact, I've found the only fletching the Jo Jan does better than the EZ is when using fletching tape rather than glue. No two ways around it, the EZ is designed to glue the fletching on, not tape it.
In fact, I've been fletching carbons & alums with feathers & vanes with my EZ all weekend, and have to go downstairs & take one out now...