Well, it will still break before your mech/frame. However, that style of hanger isnt the best, and very small knocks still make it bend (very annoying!). I think its a great idea, I've got one to try out.
The finish on the one in the picture looks like its from chucking the hanger in a swirling pot of ceramic chips to clean off the burrs etc, and then anodised (as the description says). The one i've had hasn't been through the second stage, so it looks quite 'raw'.