Nope. But I'd be interested to hear your experience. I love my SSM Aspide Glamour, but it's really not meant for riding in the aero position. The Mantra looks like it'd be better for that.
I've tried two Terrys (regular Butterfly and Zero X) and the cut-outs both pinched me. Not good. The Mantra's cut-out looks big enough that that won't be a problem.