I didn't even know about the one piece. Mine is the 2 piece. No problems except light scratches between the two pieces. I found it to be great. This stuff is interesting. In almost all forms of vibration control, which this is, one thing will work for one person and in a very similar, though not identical circumstance will not work for another person. Vibration control is tricky business and sometimes it perceptively makes things sound worse, even though if you objectively measured it, it would technically be improved. I know that vibration control in everything from speaker cabinets to racks to record clamps can be important. It's very interesting how different the results can be from two very similar instances.