I try not to use them, but they seem fine for basic SPI/UART/etc. Someone did an analysis of the dies, and apparently they compare favorably in some ways: http

I try not to use them, but they seem fine for basic SPI/UART/etc. Someone did an analysis of the dies, and apparently they compare favorably in some ways: https://zeptobars.com/en/read/GD32F103CBT6-mcm-serial-flash-Giga-Devices https://zeptobars.com/en/read/GD32F103CBT6-mcm-serial-flash-... I haven't tried anything complicated with the peripherals though, and the thing is, STM32F103 chips are so cheap already. The design is over 10 years old, and ST is so good at making them that most "64KB" chips actually have 128KB of Flash. The GD32V chips are very cool, though; they keep the STM32-alike peripherals, but they use a faster RISC-V CPU core (rv32imac).