Which among your guitars need the upgrade? which among your guitars do you think the d-activators (good for drop tuning) would suit best?
if you can answer those two questions, i'm pretty sure you'll be satisfied sa magiging result ng pagpalit ng pickups.. otherwise, it would be more likely a "change in tone/output" rather than an upgrade.. mararamdaman mo na nag-iba yung tunog pero di mo alam kung good ba yun or bad..