If one currently owns no CD’s/SACD’s (a rather young person, presumably), and asks the question to help decide whether or not to start buying them, keep in mind the cost of building a disc library. At, say, ten bucks a disc, a modest collection of 1,000 titles will run $10,000. I have somewhere around 3500, so even if streamed-sources sound better, I need a transport. It’s kind of late to start buying CD’s now, though they are much cheaper than they us to be, and will in all likelihood be even cheaper in the not-so-distant future.