TLDR - I don't recommend it, poor quality, very overpriced in my opinion.
Let's start from the top - the headstock. The tuners are okay, they are not bad, not good, just average tuners. The nut is installed unevenly, it is shifted a bit towards the 1st string. It doesn't make the guitar unplayable but it definitely should not be like that, it's a serious issue. The fretboard is okayish but I've noticed something like a little hole in it which looks like a little knot. Some of frets have coating like they are covered with some sort of dirt. Also there's fretbuzz all over the fretboard. Neckdive - sure. The volume/tone knobs are okay but the toggle switch is dangling. The bridge was installed also unevenly for some reason but it wasn't that hard to fix it. On parer this guitar should look gorgeous and brutal but in reality it looks like it's made of plastic, like a toy and that looks cheap. Maybe it's just mine impression.
The pickups are okay, I've never played on EMG pickups before but it doesn't feel exceptional, it's just pickups. If I compare it to my other guitar which has passive Duncan Designed pickups - EMG's sound feels tighter, more compressed but DD's sound feels a bit brighter when playing. Surprisingly when recorded both pickups sound identical.
I not very happy with the neck profile - I always considered Jackson as guitar manufacturer for metal guitars and therefore they should have a very thin neck. But in this case it's not very thin, it's playable but honestly I expected more. I have another guitar which is also kind of "metal guitar" and if I take it after playing on Jackson, I immediately feel the difference how easier it is to play. But once again, it's not terrible. The other thing which I'm disappointed with is the higher frets accessibility. The neckjoint is pretty thick so the higher frets on 1-3 strings are pretty reachable but it forces you to curve your wrist in a very unnatural way to reach 22-24 frets on the strings 4-6. Sweep picking wasn't comfortable at all on this position for me.
The only positive thing which I can say about this guitar is that it is super light. Unfortunately that's all I can say.
So the verdict is that I don't recommend this guitar. This is how I imagined js series to be. In my opinion the honest price for this guitar is 400€ at best. I have 2 guitars which cost less then this Jackson but both of them have much better quality.
Not sure if I buy any of the Jackson products in the future.