I bought this because I am really a 'minimalist' at heart and wanted to advance from the Arduino heavy code/memory overhead to programming the raw uC where I could access all the chip features and follow my minimalist desires. I am a long ago retired programmer and was schooled in such archaic languages as Pascal and Cobol along with several others. However, most of my programming was done on databases and now I wanted to play/learn with a relatively - new to me- language, C, and make some little projects for my use and enjoyment. I wanted to fully exploit the chip to it maximum capability. So I started bread boarding the 328 and immediately ran into problems with the rat's nest of connections when circuits wouldn't work (I know we've all experienced that miserable situation). Fortunately, I'd been reading Nuts&Volts and when Andrew began his series of "Beyond The Arduino" I saw the answer to my rat's nest problem. The TOADSTOOL. This is an incredible product. It contains everything needed to assist bread boarding a project. It's as small as practical, fits perfectly on the bread board and contains all the header connectors for SPI, I2C and UART. It's obvious this product went thru extensive thought, design and testing iterations. The result is near perfection. I highly and unequivocally recommend purchasing the TOADSTOOL to everyone who bread boards their projects.
That's how easy it was to get my Atmega328p project working. Rip the packaging open (because I couldn't wait to get started), plug it into the breadboard and apply power, and the LED started blinking.
What did I like about it? - A good way to get away from the simplicity of the Arduino and start working with the real microcontroller... but without hours troubleshooting bad breadboarding of the micro directly - Fits snugly on the breadboard with decent space to connect components - The pins are labelled! No counting from 1 to 28 all the time - SPI header that worked with my SPI programmer and my Atmel ICE debugger - 3.3v or 5v power supplied on the board - and you have flexibility in choosing a crystal - Common header for add-on modules - next on my shopping list
The documentation was fine - got me started - but not outstanding. However then i found a whole lot more useful info on the owner's crash-bang-prototyping website.
Definitley worth it, and definitley going to enjoy my projects with this board.