Centurion's, particularly Ironman models are not really race bikes and do lack the absolute "twitchiness" of a full out race frame. That being said, it's still pretty responsive while maintaining a bit of comfort during a ride.

I think the best comparison in modern terms would be to think of the Ironman in terms of a Specialized Roubaix which can be raced quite effectively (and is in the Pro Peleton) vs a Specialized Tarmac, which is a full blown race geometry frame set.

In my opinion, an Ironman handles and rides quite a bit above what it's price range is. Of course, if you decide to liquidate your IM inventory they a re all junk and I'll make you a nice low offer just to get them out of your hair, lol.