I have used one and noticed no difference in quality....it just allowed me to use a combo digital / analog input .
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While I have't used those particular adapters, I have used cheap no-name ones and haven't detected any difference. If you only need mini-Toslink on 1 end Lifatec makes a nice glass cable. I've had one for years.
Wireworld has your back. This cable was the one that actually made realize cables make a difference. I use it to connect my imac to desktop DAC.