I have a TTW copper ring; 600 gram one I think. I used it at the same time as a VPI ring. The VPI, being much heavier, flattened warps better but I thought the overall performance was fairly close. The VPI is quite heavy and harder to use than the TTW. Since I am a VPI dealer and not a TTW dealer I am not biased against the VPI, it does a good job. Either will improve the sound of most records.
