I've been running 31.8 for a couple years now. I like 'em. I have an Easton EA70 and a Bontrager Crowbar OS.

The Bonty is a heap. It's plenty stiff, to answer your question. I just don't like the sweep or rise. I really don't like OEM crap anyway.

The Easton is perfect. I cut it down a bout an inch. The sweep and rise are great for my dually. It is also very stiff.

I have read that the Easton CNT bars are actually stronger than the aluminum bars. I just don't think fatigue over time would be stellar so I have stuck with aluminum. I can't afford to replace expensive components every year.