the easton e-z fletch is the old arizona e-z fletch, and any offset or helical is built into the arms. it is not a fletcher with any usable degree of adjustability, particularly with fletch offset/helical in mind. yeah, it'll do 3 vanes at once, but these days with super glues and fletch tape, doing one vane at a time is just about as fast as 3 at once ...
the e-z fletch is a simple fletcher that works well as advertised. however, there are far better fletching jigs to be had that will allow a much greater amount of use and adjustments, that include fletching from dead straight to full twist helical and any degree in between, as well as doing 4 and 6 fletch.
the bohning ...
... or bpe/grayling ...
... are excellent polycarb jigs at low cost. one could more than double those price tags with a bitzenburger, and having had a few of those, i'd still rather have my 3 bohnings and 2 graylings.