Works with all standard SD Cards! (dependent on your library 1 to 2 GB recommended for embedded use much more is just crazy overkill for most applications).
Easy to wire to any Microcontroller that has SPI support (or any microcontroller with a programmer willing to write SPI protocol from scratch).
Easy to use examples, and instant compatability with the built in Arduino library.
Working Voltage 3.3 & 5V(DC Both required), 7 wires required (including power and ground).