I think we're using the 1515, I'm not completely sure (
Bot Pic). But anyways... I think we used that and we still manage to bend one of our protection beams on the front at MMR (
Front pic: it's the thing with the tinted polycarb over it). You could see the curvature when looking at it from above, but we didn't notice it until nationals...
Of course... that was hitting the goal, full-speed (12fps), without stopping. Nothing else broke... except maybe the goal.
Other than that, the stuff has held up fine. We stand on our robot all the time and nothing has broken.