I put in the Geezers, I consider it an upgrade. Although I really like the original P pick up, In my opinion, the J was a bit noisy and anemic. It’s quieter and ballsier now.
I put in the kick ass bridge and I love the looks. I like being able to adjust the spring spacing a little bit. Absolutely no change in tone to my ear.
The most recent addition was a drop D tuner, which we use for a lot of songs. This was simple. At the advice of @Malak the Mad, I got the chrome and it is really hard to tell that it’s not a perfect match for the stock tuners. I left the other tuners alone.
It’s such an easy bass to modify and all of those can be reversed if not to your liking.
I love the Labella deep talking bass strings but I found the low tension flats to be a bit too floppy for me to dig in. We play a lot of metal and I had to swap them out for something a little stiffer. I had to set the action higher than I like to get the low tension flats to work for me. The tone was great, though, when I could play with a lighter touch.
Enjoy your Aerodyne!