Eliptical Chainring

I asked about this a while back. http://beginnertriathlete.com/discussion/forums/thread-view.asp?tid=126081&posts=8&highlight=Q-rings&highlightmode=1#M1570548 . I didn't buy them yet so I can't vouch for them personally. I've seen mostly positive remarks overall. Use the search function for Q-rings and some more threads will pop up for you.