I haven't wrapped my hands around an ESP guitar in ages but the ones I have played from the 90's, I always thought were great playing instruments. Yesterday I got to try out the ESP BK-600 that a friend of mine bought for his son.
This thing is a beast and if you are playing metal or anything heavy really, I think this axe is a good choice and the split coil pups make it very versatile for other styles as well. It seems to be a very solid and well built instrument that came with a great setup and was ready to rip straight out of the box.
Anyone tried one, have one or something similar? If you are looking for a new axe to play some heavy music, this axe is worth a test drive. I thought it played smooth as butter and I really liked the characteristics of the pups.

https://www.espguitars.com/products/17926-bk-600

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Is this the guitar Bill Kelliher designed after leaving Gibson?

Good question. I have no idea! I didn't even know it was a signature model until I looked it up the ESP site today.

after buying an EC 1000 , it had tuning uses , so I thought it needed a graph tech nut . It did not help . As I was in the store , myself and the Tech. started pulling multiple new models off the shelf and each one could be thrown out of tune by doing extreme vibrato and by extreme vibrato i mean necessary vibrato. We came to the conclusion that it is the guitars design/build ( much the same with Les pauls ). So I would say play it first and make sure .

It's the string break angle over the nut, especially for the G string. There's improvements you can make, but it's generally a design I avoid now as well.

I had that issue with my ibanez after adjusted the hight of the nut myself, being locked nut I didn't care much for a while. Later figured out giving a slight angle to the nutthard the headstock (barely visible angle) solved the issue.

With standard nut I'd guess very brief filing the nut string slots would solve the issue but that sort of detail can't be made in the LTD factory to keep the guitar affordable.