In summary, the SAM4S series, Microchip offers a general purpose Cortex-M4 flash MCU with the perfect balance in between performance and power consumption. On top of that the SAM4S memory density reaches 2MBytes, the maximum flash density for a Cortex-M4 flash MCU.  Finally, Microchip also offers a set of tools and software example free of charge to ease development. Additional details are available on Microchip's website which is located at http://www.atmel.com/products/microcontrollers/arm/sam4s.aspx.