Seymour DuncanMicrophone for Electric Guitar - Strat Bluetooth Hyperswitch 5-Way Selector Switch

Super easy to install, no soldering required. Works great. May need to pick up a few of these for other guitars.

I've always liked using atypical 5-way switching schemes, so this thing is a no-brainer. I don't love having a 9v battery in my guitar that will need to be changed eventually, but it's well worth it for the flexibility. My one and only gripe is that you can't do series/parallel on a humbucker. Are you listening, Seymour? That would be an amazing addition to an already awesome feature set.

This gives you a lot of options for pickup selection and combinations and the app works well. The only caveat is that you have to have enough room in the control cavity for the size of the switch AND the 9V battery (if you don't have a battery box already in your guitar. I can get the switch in there, but there is absolutely no room for the battery. Had to run the battery wire to the outside and use some double stick tape to mount the battery on the back of the guitar. Not ideal but it does make it easier to switch out the battery when it dies.