Reason to choose it:

• Hackable (er9x)
• Compatible with frsky DJT telemetry TX module
• Cheap!
• Can be hacked to accept frsky DJT telemetry.
• Can accept additional slave controls.

Improving your flysky fs-th9x:

• Add backlight to LCD. http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=16720 (Instructions are in the pictures) (You don't have to peel anything in the backlight. Just put the backlight peelable side againts the LCD)
• If you have a FLYSKY fs-th9x. You can replace the included transmitter with a frsky DJT telemetry TX modules, just by replacing the box on the back of the control. In case you have a new turnigy 9x, you have to remove the board on the box on the back of the control, and add a frsky telemetry DIY inside of the controller case.