No experience with the Do-Wins, but if you're looking for an inexpensive Oly shoe, VS Athletics sells some for $70. They are true to size lengthwise and somewhat wide. This is perfect for me since I have wide feet. If you really want the Do-Wins, my experience with other shoe vendors has been that if they say go down a half size, they're usually right. You don't want to be swimming in Oly shoes. The Chinese may be using UK sizing for their shoes. UK sizing is, in fact, a half size different from U.S. sizing.
I am puzzled by the recommendations for the Vibrams. For deadlifting, I agree that a Vibram-type shoe or just socks is the way to go. For squatting I can go either way, but I find squatting in OL shoes to be very comfortable. But for doing the Oly lifts, OL shoes are the way to go. I wasn't able to do full cleans and squats until I got some OL shoes.
There's a reason why OL shoes exist and are worn by serious OLers. One last thing - for someone planning on competing, some meet directors will not allow Vibram-type shoes to be worn in competition. Plus, you'll look like a dork on the platform in Vibrams.