Foley used to sprint on the bars, seated. Something must have happened as it's been years since he's done that.
The Cane Creeks are good but there's no resting the upper body, and you can't weight the bars too much, else the bike gets unstable. The longer distance forward + the narrow distance apart seems to make for weird handling. For example I'd never use the bars on a long/fast descent. It's more stable to hold the tops next to the stem.