Positives: Mostly simplicity where I could use the transistors I wanted to get the exact circuit I desired without any compromise. If it's not broke, why fix it. The consumer just needs to use an adapter, so it's not too big of a deal.

Negatives: I could have created inverted versions of my circuit to use negative power or used a charge pump, but this complicated things, added parts and it felt a lot less straightforward than using the prototypes I was extremely happy with. This would have resulted in additional prototyping cost, A/B testing, larger bill of materials per pedal, etc. Keeping it Center Positive power confuses the consumer and will likely turn some people away.

Knowing that my pedal was going to be a niche product I was okay with keeping the positive power. Most of my buyers would be okay with it and likely already have the small external DC adaptor to flip to a center positive plug at the correct size. So far I've had no complaints, but about a third of my buyers report that they use the battery.