O-ring Versus Regular Chain

[RichInFla]

I was thinking of replacing my drive chain, which is showing signs of rust. I can get an new chain for $16 or an "o-ring" chain for $42. What's the difference and is the o-ring chain worth the extra money ??

Thanks.

and yes, after 3 weeks at the shop, I finally got my bike back. Should have replaced the regulator/stator myself !! I could have done it if I knew that's what it was !!