The Eleven is an Arduino Uno R3 with a few enhancements. It uses crystals throughout, which I think may be the most relevant change. Other differences are the relocation of the LEDs to a spot more visible when a shield is installed, a micro USB to allow the first shield to seat level and not short out, and silkscreens on the bottom and top of the board, so you can see what you are doing. There is a prototype area, which seems handy until you realize that you can only use it once before it is time to replace the whole board. I don't let that spoil my view of this board though. Overall this is an A+ Uno.
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