Quite a bit....I'm a gear junky. Once I find what I like, I pretty much stay with it. I love Bardens, and it's so great having a single coil sound with no buzz. Even if I don't change the pickups, I'll do some rewiring or push/pull pots to split or parallel humbuckers. My Hamer Sunburst , my G&L Skyhawk, and my Les Paul Standard are absolutely stock but everthing else has been tweaked or replaced. Over the years I've had DiMarzio's and Duncan's of most varieties and some Fralin's. I have not had any experience with Rio Grande's or Lollar's or some other booteek pickups but hear good things about some of them. So someday maybe I'll try some.