I usually wear a 11.5. I needed a 12 in the Gaerne SG10, so I ordered a 12 also in the Balances -> way, way too big. The 11's fit very nicely. I think they run slightly big compared to "norm" in my limited experience.
Great boot for general use and light dualsporting. I tried some longer enduro/trailrides and found the sole too flexible/soft to stand all day long trying to muscle a 450 four stroke around the woods - the much stiffer MX boots are necessary for that kind of riding. For everything else - street, ADV riding (whatever that is), dual-sporting, trials (obviously!), etc., I love the Balance Oiled.