First ride today on some 740mm Syntace 740mm 12 deg bars on the Tallboy. Have been running 685 mm 9deg carbon Eastons on both bikes for a while now. Went to Ironbark so no trails with narrow trees.
First impressions were slightly less weight over the front (kept the 70mm stem) for the climbs but didn't bother me too much. Not ideal for race though.
On rough downhills it was seriously a massive change, I thought I must've had a flat tyre I felt so, sort of 'disconnected' from the ragged trails. Not sure if this was just due to the extra width or cause the Syntace bars have more flex built in, probably a bit of both. Heaps more stability but a bit of a loss of feel, would not be a concern on an aggressive front tyre.
Will withhold my judgement for now.
The 12 deg felt very comfortable and didn't make it feel like a cruiser bike. I would be concerned about cutting them down much with the 12 deg sweep though.