Although it is slower than the ESP32 and currently lacks bluetooth/ble functionality, I believe it will become a best seller. The support from Raspberry Pi, the good price, and availability give it 5 stars. It is unfair to compare it to Arduino, here we are talking about 2 ARM cores at 130MHz (easily goes higher) plus onboard wifi. An interesting feature is the programmable PIO. My impressions, both in the Arduino framework and in MicroPython, are excellent. However, I would like bluetooth support, otherwise for now, the ESP32 is more mature and more complete at a similar cost.