I've taken tests at 2 centers in the greater Boston area. I took the GRE a few years back (senior year of college) at a Prometrics center in Lexington. It seemed pretty standard, they had headphones, dividers, nice enough staff; no issues at all that I was aware of. I later retook the GRE (and took another test a year or so before for something else) at the Prometrics office in South Boston, just on the other side of the river from South Station. There, also didn't have any issues. They had headphones, dividers and all, staff was not as nice and they seemed to take all the procedures and whatnot more seriously, annoying as that is. There's one other place to take the GRE in the area that I know of, on Comm Ave by BU, but I avoided that one to stay off the Green Line and away from all the BU kids. No idea what that one's like.
