I have those St. Martin risers, both the 7 and the 14 mm versions. They do make your bike feel different. However, I tried to use them with Odyssey Flatware forks, and there is some play on the bearing that sits on top of the riser, no matter how strong you tighten your compression bolt. Later on I tried them with St. Martin AJ forks, and the fit is perfect, no play at all. So they seem to be made specifically for St. Martin forks. I have not tried them with any other brand. Just letting you know.
PS: I also know someone who tried to use them with older, non-integrated forks, and the riser broke after a while. It also seems that there was some play.