I do, but I am bitter that my server doesn't allow access to plexamp for anyone but me the server manager.
I personally bought Plex Lifetime Pass for my family use, I would not have bought it just for personal use. The only outcome of plexamp behind pass for every single user is that I get less out of my server, my family are never going to pay A$6.00 per month to rent a music app with only my music.
I also recently found out that none of my newer users can even download from my server, which wasn't the case when I bought my lifetime plan. Not that downloads work at all.
At least with Symfonium I can buy the app outright, if all my family members were on Android we'd go that option.