Do you mean the Whisper wheels Vickie sells? I've heard they are quiet but they are not angle adjustable and often are tilted down too much that the hedgehog slides out or after a bit of use they start to sag so hedgie slides out.
Bryan is working on the website as we speak. He is also video recording and photographing the wheel. You can't rush an artist. But I hope the site is up soon. I have several wheels ready and am making more as time goes on.