I got a set of these a couple of months ago, and installed them on a Cordoba tenor, The other day while playing, SNAP! My A string was flopping in the breeze. I thought my knot had failed, or the string broke, but nope...the Ratio tuner post had failed 1/2 way up. Glad I had glasses on, as that little piece of plastic went flying. My uke had Martin M620 strings, tuned to gCEA, so nothing out of the ordinary there. Anyway, I opened a ticket with Graphtech to let them know, and my dealer is sending me a replacement tuner. Despite this, I really like them, they work well, and look better than geared ears.
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