Picked up a used S520EX on Monday night at the local Guitar Center.
First time in the store... I don't do chain stores as a rule.
Anyhow, the setup was absolutely horrible... no wonder it was mint, and less that 400 bucks.
Long story short:
2 hours setting it up (and eating diner, watching TV, etc)
Pickups... hmmmm I can think of all kinds of things I will be trying in there with that mahogany body... but the stock ones don't completely suck.
Stay tuned on that.
ZR trem... once the return spring bar was removed so it was full floating... simply stunning.
Neck is dead perfect (now).
Overall, I rate this right up there with (GASP!) my JPM P2, in terms of how she plays.
That's just this one, vs. that one type stuff... but... hell... for the difference in price... well, I don't think I can s**t on Korean guitars.
I've had good experiences with PRS Korean models as well.
I'm just not sure they have enough time on the assembly line to make them perfect.
You end up with a rough sketch... spend some time setting up/dressing frets if they are sharp on the edges... get a kick out of working on guitars, and it's a no brainer.
Pay big bucks cuz you need it perfect out of the box, and, well, you pay big bucks for that, right?

Cheers!