Some people that bought legacy eBooks with LCD screens, as well as those who started with Palm devices, say they still use them. If a device is adequate for reading, then you can use it a long time and not need to worry about whether something else is "better". I love my Sony Reader -- use it all the time -- and if something better comes out tomorrow, it is only interesting, not essential.
A friend once commented that sometimes audiophiles find themselves listening to the stereo rather than to the music