i booked my a+ through prometric and did my exams in lush test centres. free coffee or water, magazines in the waiting area, blah blah. they were also the kind of places to go if you had a few grand burning a whole in your pocket (or your employer's pocket) if you wanted non-residential i.t. training on certified and non-certified courses.
i did my network+ through vue and it was a room off a computer component wholesalers, with no waiting area, nevermind magazines, and no coffee or water. i used them as i found that you could get vouchers for comptia exams in europe if you used vue centres.
pricing will dictate who i book my microsoft exams through. at the end of the day, if i can get the exams cheaper and know my stuff well enough to pass, it makes little odds if i can get a coffee beforehand or not
I used prometric in both my A+ tests and they were as you described.
You think those test centers have to be prometric+ certified?