非常糟糕的体验，尽快升级吧
发球机硬件不错，但是app做得这么糟糕真是说不过去，一堆问题。专业模式自定义参数保存不了，每次使用都要重新自己调整参数，非常影响体验。
Difficult to use. Poor English translations.
App needs an update. Poor translation to English. Some portions are completely. Lank like voice control instructions. Error messages are in mandarin. Poor user interface limits the functionality of the hardware.
machine has potential but limited by terrible app
I just purchased the Tero machine. While the hardware itself shows great potential, the companion app is incredibly frustrating and completely limits the machine's functionality. The user interface is not unintuitive, firmware updates fail to work. On the court, the balls rarely land where they are visually pictured on the screen, and it is impossible to tell if the issue lies within the app, the hardware, or the communication between the two. To make matters worse, the English version is riddled with typos and several critical error messages pop up completely untranslated in Chinese. This app desperately needs better multi-language support and major bug fixes before this machine can actually be usable.
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可不可以上点心，把APP做好，把产品做好
起始界面Your tennis level，英文错得一塌糊涂！