As Jay mentions, the really unique feature of the 2001 was the antenna peaker thumbwheel control. To my memory, this is/was the only portable ever to incorporate this and it is an amazing tool. All of the criticisms of the 2001 aside, this is a real piece of radio receiver history. I found mine LNIB and had it gone over by Dom Laven, the expert in 2010 and other SONY radio upgrades. He installed a LED in the 2001 which really makes a difference, and corrected the issue with lack of contact in the battery compartment. Having both a 2001 in great condition and 2010 is a real joy.