Hubcentric Rings

Just want to see what people think about hubcentric rings, are they necessary, yes or no, and WHY.

I personally dont believe that hubcentric rings have any use, other than for seating the rims on when mounting. Depending on the lugnuts used, if they are tapered lugnuts then the rim should center when everything is torqued down properly.

Some people seem to think that hubcentric rings help put the load on the hubs rather than on the studs, but i think thats bullshit. Besides, arent most hubcentric rings made of plastic? What good can that be?

I've never used hubcentric rings and all the lugs I've used are conical tapered, and have never had a problem with vibrations. I am just curious what others seem to think here.

Cheers
- mike