I ordered assembled PCB boards for a USB-to-I2S converter from Elecrow. I am satisfied with the service. The assembly and ordering of the parts took a little time, because some components are no longer available through normal distribution channels, but Elecrow managed to source everything that was needed. The project manager at Elecrow handled the order professionally and brought it to completion. There were also a few issues along the way with selecting the correct components, but these were resolved as well. I recommend Elecrow’s PCB assembly service and I will definitely use this supplier again.