Actually, it is more complicated than that. Since there is no error correction in the digital audio signal, any degradation in the signal can cause a change in the stream. This degredation can be missed 1's and 0's, or it can be slight differences in the timing between sending and receiving.
This is one of the reasons why there is no clear-cut answer- some people have a difference that is noticeable to them and some people don't. The only good way to find out if it makes a difference to you is to try it out (hopefully, with returnable cables).
Which part of the link are you wondering about? As a general statement I'll simply say that much of this depends upon the frequencies you're dealing with as well as the cable lengths. Offhand, I don't see too many problems in the lengths we're going to be using.
For me switching from a plastic toslink optical cable to pure glass has brought with it greater detail, tighter bass and a more open soundstage. BEST $15 I spent.
You must be joking??...I find this claim to be HIGHLY impossible...placebo effect may have caused this "change"...the "I spent more on a "better"(glass) cable, so it's got to sound better" effect.
Like everyone has stated you can't make 1's and 0's sound "tighter" or more "open", or "detailed". PERIOD
But hey, at least you just lost the cost of a DVD instead of a car payment doing the "upgrade".