All those jigs, the BPE, the Martin, Bohning, Vador, and even the vaunted Bitzenburger, are made to a pretty similar design. There may be slight differences in design like how you go from three fletch to four but they're all much the same. The Bitzenburger is made of cast metal rather than injection molded nylon so you may be able to say it's more durable but that difference comes at a pretty steep price.
Most of us using a "plastic" jig can easily say how many years it's been turning out fine arrows for us but I've never heard of anyone who can say they've worn out a jig. So long as you don't drop a Bitz on a concrete floor or put a Martin too close to the kitchen range, any of these jigs will be good for a very long time.
Pay what you want, get the features you want on the jig, and go make great arrows.
Guy