GPB was my go-to for a few months after they started offering upload. The server-assisted text-to-speech is quite good. I just started buying Amazon/Audible synced titles, and opted for a KPW as my first eInk device, at which point it was easier to jump into the Kindle app whenever I was reading on an Android device. If I needed text-to-speech, I'd still convert and upload to GPB.
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