My Schecter came out of the factory, I think, with D'Addario roundwounds. It has no active electronics, just the passive Schecter "Super Rock" pickups (humbuckers) I played them for a while and they were okay, but I was due for a string change and wanted something different. Originally I was going to go with GHS flatwounds, but I was concerned that they wouldn't work well with the slapping/popping I was working on a lot. So I went with these;
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I have to say these are very, very impressive. I went with the extra lights because I had read that the coating increased the overall size of the strings and some people had experienced cracked nuts when using heavier gauge strings if they didn't file their nut. They look awesome with the coating and colored tops, and they are very, very easy on the fingers. I can't say enough about the strings. My OEM strings were kinda dead in the mids, I'd hit flat, dead sounding notes (especially on D and E on the A string), but these brought my completely stock Schecter to life. They work great for slap-n-pop, and I have played for as long as 4 hours with no discomfort, and I'd buy these again in a heartbeat. They're not overly bright, but they do bring a slightly darker, "smokier" tone to my bass. I couldn't be happier. I'd absolutely buy Rotosounds again, they're my string of choice from here on out.
A little more pricey, but worth it IMO. If you like the sound. I play mostly blues and classic rock, so they work really, really well.