I am not an owner of any LeMond "spined Bike", but I do own a 2007 LeMond Buenos Aires carbon frame bike because I like his geometry philosophy. I have always steered cleared of any "combo material" bike because I have seen three failures with people I know. The failure was always at the joint, the place the carbon met the metal. Two were Cannondale Six 13s and the other was a Bianchi.

My deduction from all these was that the adhesive and/or bonding method was the issue. I will never own a two/or more frame material bicycle because of this.