It does make a difference, particularly with records that are not perfectly flat -- but whether it's worth $500 is a judgement call. While I love VPI's products, I personally think the clamping ring is grossly overpriced, despite being made of stainless steel. If your LP's are in good condition (i.e., not warped), then the regular center clamp will suffice.
VPI periphery record ring for VPI Scoutmaster
How much of an improvement does the VPI steel periphery record ring make? Do you think it's worth the $500 US retail price? Or would it be advisable to first look for the SDS, then afterwards purchase the ring? I'll be using it on a Scoutmaster turntable.