I have a set of Big Ears I have been using for almost 3 years. I have worn them on a Harley Softail with loud exhaust, Harley Road King, and R1200GS. The GS is my current bike. The Big Ears cut the wind noise extremely well. I bought them so I could listen to music while riding, and wasn't even thinking about sound reduction. However, that was a pleasant side effect.
Try them while riding. You should be pleased. Make sure they are inserted properly. If not, they won't work right. I even wear mine when mowing the yard and running my bulldozer.
Bottom line: they will cut the wind noise to an almost neglible amount, but they are not foam plugs. When mine finally wear out, I will DEFINITELY buy another set!!!
I did try them on the road at highway speeds and the music was not audible over the wind noise. They were inserted correctly; even sent them pics of the first (returned) pair to assist them with the second pair. The left one under the helmet feels like a wad of bubble gum. As well, the left one has, ever so slightly, a wire protruding out from the earpiece which is a major irritant.
As I mentioned previously, my audiologist has told me that I have very soft ear cartilage which makes a good seal difficult. This I explained the mold maker at the time the mold was being made. I was assured that that information would be taken into consideration while the mold was being made.
For now, I will simply put these away until the Toronto Bike Show in January and then return them to have new molds made. I will let you know in the spring when the new earplugs arrive if I had any better success.