I definitely would not get a 1/2 size bigger. I wear a 7.5, got a 7.5 in these shoes, and they are slightly too big - not enough to size down, but enough that I have to stick a heel pad in. Definitely don't size up.
i have a narrow foot and normally wear an 8.5 in everything, but these were so big on me that i needed to size down to an 8. and even then there is still some slipping, so i have to use a foot insert. so i would definitely not size up. if your foot is on the wider side then they should be tts for you, but you may need to size down if you have a narrow foot.
__________________
"to be nobody but yourself in a world which is doing its night and day to make you everybody else, means to fight the hardest battle which any human being can fight, and never stop trying." - ee cummings