How much improvement with better toslink cable?

Splurge and buy a $10 delux model from monoprice. It looks really cool and high end!

What Sufentanil said.

You might want to try an Amphenol glass cable just to put your mind at rest. There is a source for these if you to a search for Amphenol in discussions.

I believe I did detect a difference going to glass, but you must make that call yourself with your system.

Glass toslink make a huge improvement over regular in my opinion. I have detected almost zero difference between cheapo and branded non-glass toslink, but the upper end Audioquest and Wireworld supernova 5+ toslink will stand out far above the standard toslinks.
I have no experience with the amphenol.
I am a dealer, but do not sell any of the brands mentioned in this reply
good luck

What Buff said. Don't understand why Toslink is so quickly discarded as I've heard it sound superior to coax on more than one occassion.