I've only recently started. I brew beer and have a number of paint straining bags I use. I used them to filter the kombucha. Worked fine. I don't see any problem with using cheesecloth, bu I never have.
I find cheesecloth to let too much through. I cut up flour sack towels. I just rinse with hot water after use. If you don't mind the discoloration they are infinitely reusable. I have also used cotton painters towels as filters. You can get them a home improvement stores and they are only a few bucks for about 20.
Thanks for the prompt replies. I'm interested in this topic because I've just started to sell cheesecloth grade 50 on amazon and read a lot that it can be used for kombucha. Opinions and real reviews will help me to clarify whether this item can be useful in this area. You can see attached the photos of my cheesecloth.