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The difference between this board (and "nano") and other arduinos is the lack of a dedicated processor for usb programming link. This returns in a cheaper product, and maybe some difficulties when configuring IDE mainly under linux. You'll have to search on the internet for these problems if you run into them, which implies having a system with root access, how to apply patches, or modify configure files. The product runs fairly well, and presents the genuine arduino look. It has been delivered in 16 working days since I bought it, I consider it pretty aceptable.
My wife has no idea what all these little electronic devices lying about everywhere in our house are, or what they're for ... but she spotted this Leonardo sitting by our printer and said, "Oh! That's so cute! I love your little Leonardo." OTOH, I do know what it is and what it's for, and what a spectacular value it represents. This is a completely solid and top-notch Arduino board (and the Leo is arguably the top of the Arduino line in the '328 space) ... and is just an astonishing value here on Banggood. Don't even hesitate for a second: Snap up a handful of these before they realize what they're doing (i.e. giving them away! Free shipping?!? C'mon!).