Looks great to me. If learning how to use AVR is your only aim, then yes! You should get it. The wide range of peripherals means the tutorials won't be too tedious and maybe even useful

The things you won't learn how to do though (compared to making the $50 dollar robot and beyond) are soldering, sourcing components, designing schematics and PCBs (with CAD like the Eagle software) and all the hardware side of things.
I guess it could be advantageous to learn the programming and software side of MCUs isolated from the many hardware problems that always occur...
And the price seems reasonable!