Another glass fiber Toslink to look at are the 280 strand cables available through eBay and other sources (search eBay for "glass toslink") for under $30.
In recommending the glass fiber cables I was trying to establish a quality level that won't be bettered even by the $300 Toslink offerings from typical audio cable manufacturers.
The problem is that these generic glass cables as well as the Silflex may actually be overkill for consumer Toslink transceivers, which to my knowledge, are not available in precision low-jitter grades unlike other numerous high-grade audio parts such as op-amps, digital volume control chips, etc.
I personally use Monoprice Premium Optical Toslink (plastic fiber) cables which work quite well, however the "Fancy" satin machined aluminum connector barrel, while quite beautiful, has too much mass and I have experienced breakage of the plastic part that mates with the optical jack from too much torque leverage. Thankfully they haven't damaged the hard to replace jack.
Steve