If you buy the $$ 50mbit $$ internet you get a free upgrade to gpon... the only service which works better on gpon vs bpon.
Well, if you buy a 30M x 5M plan, you get 30M x 5M, whether it's BPon or GPon. The good news is that FiOS users get their bandwidth for the most part, much more than any other ISP can say. I love FiOS.