are there disadvantages to using hubcentric rings on your car wheels?

[spyordie007]

I'm considering buying some new wheels for my car and a guy offered to sell me his rims/tires because he is buying new ones (16" TSW Edge). He indicated that they need "centercaps w/ hubcentric rings" to fit and I was curious as to whether or not they would pose any possible negitives for usage (performance, safety, etc.). Anyone know if there are disadvantages to using wheel spacers?

-Spy

 

[spyordie007]

okay it doesnt look like the wheels will need spacers but he has hubcentric rings, are there any disadvantages to using them?

EDIT: or rather major disadvantage over using wheels that dont fit stock and you have to use the hubcentric rings to fill the gaps.