I would basically take a "JDM" engine as simply a used engine. IT's a bit of a crapshoot in exchange for being cheaper/easier than a rebuild.

BTW: That thumbnail is of ME back in the day. (about 15 years ago.. christ. I AM old..)
Now, all you have to do is figure out who the thumbnail under MY name is. Yep.. you ALL know him.... laugh

Now, I'll have all kinds of time to talk about DSMs, because I won't be busy fixing mine!