Toslink cables...do they make a difference?


Hello fellow Audiogoners. I would like to pose a few questions regarding Toslink cables. Do they make a significant impact in sound, as perhaps speaker cables would in a system. Also does the composition of the cable make a difference, i.e. glass vs polymer. I have a streamer connected to my amplifier via a Toslink cable. Any recommendations before I consider trying to upgrade the cable with little return on my investment. Thanks for your comments.

audiofool1
Lifatec are excellent optical cables and reasonable on the wallet.
Glasslined is the way to go in optical cables if you are looking at something else. 

Happy hunting
Not trying to solicit you to buy.But I have three toslinks available. One from Unique Products(1 mtr.), one from Kimber Opt 1 (2 mtr.),and one Audioquest Vodka (.75mtr). They sound completely different from each other with the Unique being very detailed / upfront,and the Kimber being laid back / relaxed,but not lacking detail. The Audioquest being the most neutral / accurate. I prefer the Kimber sonics.I have also tried a Lifatec, and the one from DH Labs.They all sound different from one another,and all have their strengths and weaknesses, it just depends on your preferences. Hopes this helps you a little.
Thanks so much to everyone for their comments and advise. Very much appreciated. I will probaly try an upgraded Toslink glass cable and compare with coax and see the difference in my system. 

Best to all