Confusion on Toslink

I've been reading up a bit on Toslink. There seems to be the inherant advantage of ground isolation, but some possible sonic drawbacks. Most of the articles I've read are a bit dated. So, here are my questions:
1) has the quality of Toslink cables and the sending and receiving circuits improved for audio?
2) Is glass still considered generally better than the synthetic cables? I see reputable manufacturers using synthetics but glass cables that are cheaper. Are some manufacturers perfering synthetics for sonic reasons?
3) Any recommendations for Toslink cables in the up to $200 range?

Of course, listening is everything. I'm just tryig to see if I'm in the right ballpark. Thanks