FYI my specialized shoes with the Boa Dials started to not hold anymore. I sent them back to specialized and they sent me them back with replacement parts and a link to a video on how to fix them. The new replacement parts have internal metal caps over the plastic so I think they will last even longer and not loosen.
Hope this helps.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Specialized Shoes with Dials