Yes. Plays well with others. Tascam did a nice job of making the inputs and outputs available to interface the mixer with outboard machines. Its a great "little" mixer.
If the tape section ends up being a complicated/expensive fix, is the decent $50 mixer still usable to you even though its bulky and heavy beyond the size of the mixer itself (i.e. are you wanting to haul it around or keep it onsite)? That's one question to ponder.
If it was me, I'd be trying to find out the condition of the heads as well as a little more info on the problem with the tape section unless I knew I'd be getting into a 388 anyway and then the $50 machine at worst would be the parts machine. That make sense?
You can likely get your money back out if it goes sour.
That's the antagonist view.
The protagonist? It wouldn't be a shocker if it was nothing more than a broken or worn capstan belt that has fallen off inside. $13 fix. And if the rec/play head is worn? Well, that's an achilles heel with the 388 siply because they are rare and NLA, BUT when evm1024 relapped a couple for me his comment was that it had a relatively good amount of material from a design standpoint and would sustain at least a couple relaps before being dead, and it has recently been impressed on me that, especially for us recreational operators, heads don't wear as fast as we worry they do. You drop your $50, let's say it just needs a capstan belt, now you're cooking. Head is worn? Maybe never been relapped or just once? Still got many miles left. You save up and in the meantime use it, when you get the dosh you take 10 minutes to pull the headblock, send it to JFR and it comes back like new and you are good to go for...years?
Tough call at $50 with questions lingering you know, but maybe not so tough because $50 even for a NF 388 is a good price. That is a small investment for a multipurpose machine if you've got room for it even if there is something drastically wrong with the transport like a bad logic card or bad motors from a faulty power rail or something. That would be worst-case scenario.
If you stop and look at it, sniff around the vent holes in the top panel above/behind the meters as well as over all the transport panel buttons. Smell for that burnt electrical smell. If something really bad happened you'd likely smell something and if not that is at least one vote toward it not being a major problem with the transport.