Works as a replacement. Buy can't get serial out to work.
The board may be small. I bought it because I thought it was better than the original in the following points. 1. High speed because the internal oscillator is a crystal oscillator instead of RC oscillator. 2. Operates at high speed even at 3.3V. 3. The AD converter is 12 bits. It's not just a copy, it's good. Can be developed with the Logic Green add-on to the Arduino IDE.