I would never consider any of those contraptions, even if you've never had it break, even the slightest bit of worrying about it maybe losing grip of your U will hinder your riding experience. I by no means am a messenger, but ride only with my Krypto New York chain and EV disc. I think this link might give you even more options:

http://www.kryptonitelock.com/inetis...s_item&pgrp=20