Periphery outer ring thoughts ?

I use a peripheral ring on my Technics SL-1200G, and the sonic benefit is clear to me (along with a Stillpoints LP weight).  They couple the record better to the platter to drain away the spurious vibrations in the vinyl caused by the needle tracing the groove.  Prior to that I ran a SOTA Cosmos with vacuum hold down and reflex clamp, which achieved the same basic objective.   Using them brings a touch greater clarity in the subtle details of the recording, and a better overall frequency balance, IME.
Do make sure your table's bearing and motor are up to it.  With the Technics there is no question.

The weight concern to me is more about distribution.  You have to have some clearance built into the engagement interface of your ring (due to the variation in LP outer diameters), and that allows for eccentric placement - - in fact, challenges you to do anything other than place it with some eccentricity (perfection never happens).  With the Technics' powerful DD motor and servo, I have no real fears of it being much affected by an uneven weight distribution.  But with a low-power belt drive TT, I wouldn't rule it out as an issue.
I have encountered enough outer diameter variation that I am contemplating making another ring with a larger clearance to deal with the "super sized" ones.  It's an issue.

I do not find a reflex clamp sufficient on its own, as some records don't simply respond flat.  Just tap them and you can hear the "play" and opportunity for vibration mischief.  I would agree that a well executed vacuum system is ideal.  It's too bad my SOTA Cosmos didn't sound as good as my new Technics...

@billstevenson   I made my own that fits the Technics, a constrained sandwich of stainless steel/acrylic/stainless steel.  It only weighs about 1/2 pound, but it is enough to ensure good contact with my acrylic mat., in combination with the center weight.  It's handy to have access to a CNC shop!

Yeah, Ralph Karsten was encouraging me to make more (he'd like one, too!), but I am busy enough running a company.  And I think the cost would get high, in the end, too.  It is the perfect vanity project, though.  My employees humor me with my nutty audio passions...
The design was inspired by one that had been marketed for awhile, but was discontinued some years back.  I don't recall the name now, though.