I bought and built mine as "THE" QRP rig for contesting. With all of the options, it has been a superb contest rig with an excellent receiver and with the DSP option, outperforms many much more expensive rigs. Besides, it a modification is needed/wanted, I built it so there is no hesitation to get out the soldering iron. This rig helped me make WAS QRP-CW with only a simple inverted V antenna. Can't recommend it too highly.
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Based on historic data, today's second-hand price of the Elecraft K2/100 is around: