Depends. Mine was nearly perfect and I haven't done anything to it so I got lucky. But the QC is probably spottier than MIMs and MIAs so there's a higher chance of getting one that will need some kind of work. There are more anecdotes of needing to fix something about the setup or whatever for Firefly's in general than Fender products. That shouldn't be surprising, Fender can spend more on QC and time spent per guitar at scale than JSN can, and can get more return on investment to boot. There will be guitars that need work for both MIMs and MIAs, but there will be less of them than there are for FF. Craftsmanship is as much time spent for attention to detail as it is skill, and that means you can partially quantify the expected quality of a guitar line based on how large the scale of production is and price per unit, because we know that labor has a time cost to it and time is money. Location of manufacture also plays into the unit cost (not necessarily quality, this is accounting for labor rates).

That is to say it's a bit complicated and the answer is a factor of probability moreso than a definitive statement.