I started this thread? It came up just now in the subscribed section and I don't remember this at all, but it's been 6 years! I don't usually even get involved in these types of discussions. And ironically enough in the last few years I've built up bikes for my daughters based on older Cannondales, one old time aluminum, and one Super Six Evo and they are both stiff. I tested them both out and they felt like they'd climb better, but the rider certainly does NOT climb better. It doesn't matter when you've just turned 69 and are happy enough to be able to still ride, never mind fast.
Carry on...