Does length matter with Toslink cables

I ran a 30' run off toslink off a USB audio device to a remote DAC. It was a cheapo toslink, but the quality improvement when I went to a 30' USB run and a short toslink cable was immense. Not immense like the difference between a $5000 and $10000 DAC, immense like going from Bose to ARC.

Just my experience.

Are "Toslinks" really GLASS optical fibre? Plastic maybe. Real glass fibre can go for miles, but part of this is that digital data waveforms can be greatly distorted and still be properly decoded at the destination as ones and zeros. Somehow audiophiles have adopted the idea that distorted digital pulses lead to degraded sound. Like UFOs, it's a waste of time to argue about this.

I use the Supernovs 5+. It is better than the 3+. I have not heard the VanDen Hul.

http://cgi.ebay.com/12-12ft-GLASS-Digital-Audio-Toslink-Cable-Premium_W0QQitemZ5859534931QQcategoryZ64594QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Eldartford
The Nordost Whitelight that Bigkidz mentions is GLASS fiber,I own a 1.5m .Very good cable,can't really comment on the other ones.
George