About a year ago, I bought a new frameset and it handles very well. I can tell the difference when climbing on and off the saddle. I can tell the difference in comfort. Its lighter and the handling is more aggressive. But really, I'm not that much faster. Nor will I ever be because I'm running against time. Most of us over age 60 can tell the difference 10 years makes.

I don't call this diminishing returns. I just like the ride.