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Adafruit have produced these breadboard friendly breakouts with an on board antenna so you can get to know this very successful chip. They added 2 x push buttons (RESET and user), an LED for blinking, 500mA 3.3V DC regulator, and 2 x diode protected power inputs.
Very well made. Having the 5v tolerant serial pins makes it work a treat with Arduino's.
Bit of a pig to get going with the Arduino IDE as the programs are much larger so take a lot longer to compile and upload but well worth the effort.
Its rather fussy about which make of USB to serial port device you upload through. If it doesn't work check the connections, power and then try a different make of USB to serial board.
This is a nice little unit and "ready to go".
This gets Max Points because of the support on the Adafruit website, a superb resource for these products. A great product for learning about local IoT and similar. The resources behind this product make this one of my best buys.