We retrofitted our 2014 bot for a hex frame (Octoframe, actually) last fall and used it at an off-season event. There is a brief thread on CD about the experience:
http://www.chiefdelphi.com/forums/sh...30#post1406830
We weren't on the receiving end of a lot of T-Bone attempts at the event, but our driver did get a bit of experience with it. It helped a bit with T-Bones, but didn't appear to be a magic bullet. The biggest problem with bulged side bumpers came when we tried driving parallel to the wall. Once the tip of the bulge hit the wall, it turned the robot slightly toward the wall, which started an instant vicious cycle that sucked the bot tight into the wall. I don't expect we will try them again soon.