Installed a set of these in a gibson sg standard.
I used to miniswitches to get all four possible combinations of coils.
I've ended up using mostly the p90ish setting.
The rail setting is however also very cool. I can get rather good country twangish tones with them.
The humbucker (series) setting is probably good to, I just prefer the character of the p90ish setting too it.
The fourth option, running them in parallel can get you some nice clean tones. Haven't really used it with any distortion.
As for wiring them up. Seymour Duncan has the diagrams somewhere on their site. Easy to follow.