Seems like a silly question, but I don't know which one to get to replace my very old box grater which is getting very dull. The new Microplane box grater looks terrific, but I wonder if it isn't too sharp (concerned re safety). SLT has a nifty looking six sided box grater. And of course, there's the OXO grater...pretty much anything OXO is good. Does anyone have an opinion on which is best?