All I have is secondhand from a discussion on another forum, and one guy said his reel quit with the cord out, which apparently did not have a manual way to reel it up and left him stuck there and had to fix it to reel up the cord. From his context the bay the reel was in must not have had room to simply coil up the excess. So I guess as long as you set it up so you can coil up the cord in an emergency you don't have to worry about failure, at least from a practical standpoint. They do look convenient, it's not that it takes me a long time, but my old 50a cord is like wrangling a python to coil up.
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