If I go to lift any corner of the chassis, the chassis flexes instead of the suspension moving. It's like when I had the "road - hard" springs in my mini. Both my M07 and TC4 are sprung much softer than this.
The chassis doesn't "settle down" on the suspension at all when loaded down. So there's no down travel at all. It just kinda sits on the limit screws.
The hard chassis is $44, the carbon, $63.. I wish I knew the weights, I'd definitely buy the lighter of the two.