Some reviews on Klein's Mantra Race Series:
"The drivetrain does not affect the rear suspension because it moves on the rear triangle as a whole, and that equals almost no pedal induced suspension activity. Basically, when seated and pedaling, it accelerates like a hardtail that absorbs anything you roll underneath it and is very pleasing to the lower back. A standing sprint creates the most bobbing of the rear end, lean on the fork when sprinting and this is almost eliminated."
"The Hexcel Honeycomb core pressed between two shells of carbon fiber is an aerospace process which lends its light weight and stiffness very well to the Klein’s big top tube design. "
Dirt Rag Staff Adam Lipinski (1998)