These pickups actually sound pretty great. If you are getting them for the sound, you will have made a decent choice.The installation materials and wiring diagrams are not useful, however. If you are new to installing pickups, or haven't done it much, like me, you will have trouble figuring out the wiring.- The mounting screws provided are WAY too short to be useful. They barely poke out the bottom. You will almost certainly need longer screws. Why do they provide screws for their own product that don't fit? Did they even try to mount these things in a guitar?- The springs, also, are not gonna fit. At all.- The wiring diagram describes, helpfully, which is hot and which is ground. It doesn't describe wtf the other wires are for. Since this is a "stacked" P90, it is similar to a humbucker (i.e. it has two coils), and the extra wires (red and white) simply connect the two coils.- There are no wiring diagrams that exist in the world that quite match the number, color, or placement of wires in these pickups. But I just ignored the red/white wires and focused on the yellow (hot) and black (ground) wires. Once I did that, standard P90 wiring diagrams started making sense.- The ground wire is soldered to the back in a kinda dumb way that makes the pickup **even taller** and I re-soldered and remounted the ground wire to the back of the pickup to make it flatter. Removed the excess solder, added a little jumper, and straightened out the wire bundle.For $35 or so, these are an incredible value.