I personally like the TTWeights clamps better than VPI's, if for no other reasons than they look great and the extra rotational mass should help to stabilize the platter speed even more. Plus, the TTWeights clamps are extremely well made and look so elegant. I've used 3 of VPI's clamps, including the old style HW-19 plate/knurled knob, delrin, and HRX clamps. The HRX weight is not threaded, so it relies solely on its mass to couple the record to the platter. Once I got the TTWeights clamp, I sold the HRX weight and haven't missed it at all. It works great in combination with VPI's periphery ring clamp. I recently added a second heavy TTWeights threaded clamp and will be selling my delrin VPI model soon.