I have an Axis, and a WCF 4.0.
My Axis is True Temper steel, and nickle plated, and is a lovely bike. The WCF has carbon main tubes, bonded to steel for the lugs, headtube, and stays. I've had the WCF since new, and it's been reasonably well abused. I have noticed slight hairline cracks in the paint where the carbon tubes are bonded to the steel, but I've spoken to my carbon fibre friends in the superyacht industry, and they've said don't worry about it. It's just the paint as the carbon flexes differently to the steel. It too rides beautifully, and is responsive, and fun to ride.
I recently clear lacquered my chainstay on the WCF where it had bad chain slap, and then put a new protector sticker over it. Nothing to worry about,
I'd buy them all if I were you. Or you could point me in the right direction
Diamond Back WCF 4.0 96; Diamond Back Axis 94; Diamond Back Axis R 96; For sale Diamond Back Axis Pro 93 frameset 19"
Gone, not forgotten: Jamis Dakar Sport 89?; Diamond Back Topanga 92; Diamond Back Ascent 93, 94 & 95