I remember riding a F700 with headshock in the late 90’s and thought it was so rigid and uncomfortable compared to my steel Marin pine mountain. Looked great but happy to give it back!
I went from a Marin Eldridge Grade, to a Klein Pulse and then a C’dale F800 with headshock (iirc?) between about 1997 and 2002.
The Marin was a lovely steel frame, but very flexy – I can remember what felt like the BB twist from side to side as I was sprinting occasionally.
The Klein was very stiff and direct, and was a great race bike, especially teamed with the Pace forks I had on mine. It felt like every ounce of power went into forward motion and the bike begged to go as fast as possible.
The C’dale wasn’t as direct as the Klein, but wasn’t uncomfortable, imo. Mine never felt as though it fitted me properly, despite being the correct size on paper. I think I sold it after a few years and carried on using the Klein. I never gelled with the C’dale, but a friend who borrowed it for a few races thought it was great – tellingly, he’s about 3″ shorter than me.