I just got these pickups on ebay (used). I installed them on my Ibanez RG350ZB-WK. They are dimarzio pickups. that means they have quality. but they're on cheaper guitars, not like the ones found on the $2000 signature guitars. I think they sound really good. it's just that when you put them side by side the pickups of vai and satriani, they fall short. But they can still kick butt. I think they will hold their own in a showdown.