Kilobyte's approach towards selling these modules is very wise: At the moment of my purchase, the price was hardly beatable even by small Chinese distributors. Big western electronics distributors should learn from Mr. Kilobyte, if they want to stay in business...
Module itself is excellent and versatile, with plentiful documentation and development tools provided online, by Espressif.
This does what it says on the tin. It's the most compact ESP32/SPIRAM board I've encountered, and the quality of construction is excellent. The boards were despatched promptly and well packaged.
I'm using them to run MicroPython. This installed easily. It this works perfectly, both the official port and the Loboris port which enables MicroPython to use the SPIRAM for general heap storage. I thoroughly recommend this board running MicroPython.
A small issue is with the optional HTU21D temperature and humidity chip. While it works perfectly it is warmed by the adjacent ESP32 module, which affects its readings. This is probably inevitable on such a tiny board. I think the solution is to put the ESP32 into sleep mode for a period before taking a reading. Otherwise buy without the HTU21D and use an external HTU21D breakout (e.g. from Adafruit).
It shipped the same day I ordered it. The build quality is good and the board works well. The shipping is slow to the U.S. but that's not the seller's fault. Things stall in customs for several days sometimes. Very pleased with this board, and I'm on the wait list to get more.
This is my first ESP32 board and so I struggled a little to get a serial connection working. No issue with the board - just with the serial terminal software I was using on linux. This was resolved with some quick help from the store owner.
The board is well assembled and the silkscreen labelling (both sides) of all I/O is excellent.
My only quibble is that some more documentation on setting up comms to the board would be helpful - as well as using the BME280 sensor. But this info is available on the web. At least the schematic is available which is important.