Okay, I've been seeing a lot of adverts for the Expo disc and similar WB devices. I was more than a little skeptical, especially at over $100 for what essentially looks like nothing more than a plastic lid sandwhiched into a filter frame, but, being a gear nut, I went out and bought one yesterday. First impressions? Overall, good. Not sure if it's worth $120 or not, and it doesn't always seem to work perfectly, but there is a noticable improvement in some situations. I'm going to experiment with it further, and I'll post a detailed review in a bit. In the meantime.... thoughts?