In this video I describe in detail, every single Chinese transmitter that I know of. It may not be all of them, but at least 90%.
This is the best video to watch if you're looking into buying a transmitter and don't know what to get. The beginning is mostly theory, so if you just want the reviews, skip ahead to 6:00.There is no other youtube channel out there like mine that focuses on AM/FM transmitters.
Here is my whole channel if you're interested in other TX stuff: