I'm probably doing Plex a dis-service but after a play last year I have it filed very firmly under "Too shiny for its own good" and used minidlna, but then ended up not actually needing either.
I've spent a lot of time playing with various of these big-budget projects like this (and Spiceworks, and lots of others). They are very very bling and quite impressive in their way, but I always seem to hit some major roadblock where I want to do Thing A) and project has decided that only Thing B) is going to be allowed. So I revert to low-budget, no-frills alternatives that just work.
That, or they change the goalposts and specs just after I've got it nicely set up.
I appear to be heading for a side-rant here, but hey ho, let's go with it.