Are the Mancini Mag mounts any beter than the stock mounts

I've had these mounts in my 340 Dart since 1999 and have given them hell with no problems. Since there is still a rubber biscuit between the halves they don't transmit much vibration at normal driving. When you get on it the plates move apart and the through bot contacts both plates, but at that point I don't think you are concerned with transmitted vibration:D