2pcs ESP32-DevKitC core Board ESP32 Development Board ESP32-WROOM-32U WiFi Bluetooth Development Board for Arduino IDE (WROOM-32U)

These are great. These are the dev kit c V4 versions and, at least for me, have a lot better Wi-Fi reception than the DevKit V1 versions because the antenna is hanging off the end of the board per Expressif Design Guidelines. (The V1 boards have the 4 mounting holes). They don't have the built-in LED but there is a hall effect sensor in there so you can do the HALL example or the Hello World example to test it without having to hook anything to the pins.

For a tiny bit more money, you get these chips instead of an arduino. It's amazing how responsive and we'll these work. I use them for everything and they are dirt cheap but also high quality!

Nice boards! They flash without having to press the flash button, which is nice. I've been using it's bluetooth with an external antenna as a beacon and I'm getting about twice the range I was with another ESP32 board with an onboard antenna. One note though: it doesn't appear to have an internal (onboard) antenna, so I think you'll need an external antenna to get a decent signal with wifi or bluetooth. I've used other boards in the past that had the option of using onboard or external, this one appears to be only external.

I purchased 2 of these. They worked okay...at first. After several code uploads on both modules, the cp2102 USB to Serial com chip failed. The chip is most likely a knock off as found on so many other ESP32 boards. One failed with a 4-ohm path from Vcc to ground. Perhaps this board has undergone improvement in design--like using a different USB to Serial chip, for example. If not, I would avoid these and go with something a little more solid.

Good value for simple mcus. This kit has no antennas, u.Fl connectors are populated however. My boards had flux all over from assembly and needed cleaning. Some components were poorly soldered. Everything else about the fab and assembly seems good.

you have to add an antenna to use these but I got my bluetooth proxy working in no time using these

First works well. You do have to hold the boot button until the program starts uploading, but expected for this model. I needed the external antenna because it is located far from the house. The second is a little wonky. I thought it was dead, but turns out you have to hold the reset button, then hold the boot button, then release the reset button! Once uploaded, it will not start unless you once again press the reset button. That, and a few unexpected restarts, and I'll probably not use this on critical things, just for debugging program I suppose.

It's a pretty cool microcontroller, for a couple of weeks I thought it was broken beacuse the built in led did not blink with the blink sketch. It turns out it does not have one. WiFi works like a charm on both AP and client modes