Being in the army, I was painstakingly (?) fitted for my boots. (being flat-footed didn't help) But as with most brands of shoes, these have their own characteristics in regards to measurement. Order a half size larger than you normally wear for extra toe-room. And if you are flat-footed (like me) then these are the paintball shoes for you. The Dye ATC, while a good product, run a bit narrow.
These are the most comfortable paintball cleats I've worn. Be sure to wear them in before playing with them. Right out of the box the hi-top is pretty stiff.
Take care of your feet! The right shoes are paramount and I recommend these cleats.