Not really off road but I've been using a 56cm Bottechia full CF bar for 3 years on my Spesh globe pro.
I'm a 103 kg and being a roadie have the bars about 3-4 lower than the saddle so a lot of my upper body weight (all muscle btw
) is on there.
Bike is used as a commuter, heavy duty shopping bike as well as doing Alpine climbing/descending & audax riding so gets plenty of use.
They're attached via a 140mm ITM millenium stem (& always have been) for additonal info.
Despite my somewhat agressive road style at times & reasonable mass I've never had a creak out of them and never feel unsure in any situation.
If you could find another botty I'd say buy it & enjoy it
1958 Carlton Super Python
1990's Gitane VITUS GTI Triple Butted
1996 Raleigh Titanium Special Products Division
2007 Specialized Globe Pro
2007 Specialized Globe Expert Ultegra 6700
KTM Strada 6000 Carbon Dura Ace 9000