Recently, the MASAKI52D is a hot topic. I bought one, but I recently had a good opportunity, and I think I probably won't use this mouthpiece, so I'm putting it up for sale, brand new and unused. I only played the mouthpiece a little to get a feel for it, but it has good balance. It felt wider than a Bach 5G, but didn't feel as open as a 4G. If anyone is interested, I'm waiting for your comments.