The original Athena group was crap. I had the first Athena stuff, and it shifted terribly. No one including the Shimano rep could get it to work.
By the time it got to 8 speed, it might have gotten better, but I wouldn't bet on it.
The shifting/ braking on a modern bike with Ultegra will be noticeably better.
The orignal Athena group was also heavy. My bet is that there is about a 5 pound difference in the weight of those 2 bikes.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.