I’m interested in this subject as well. I made my own kombucha for a few years, and my most recent scoby got contaminated last summer (and I haven’t gotten around to getting a new one). Dr Andrew Weil, whose opinion is not always terrible, I guess, came out against using kombucha, since there’s evidence that it can be a mild antibiotic.
BUT, it’s tasty, and other people say it’s great, so I’m curious about more opinions/anecdotes.
Also, if anyone is looking for scoby’s, check craigslist! Maybe it’s a So Cal thing, but they’re always available for free here.