The Newton was the first (and so far the only) single-purpose Apple PDA, and paved the way for the success of the Palm and Pocket PC devices that peaked prior to the smartphone era.

One of its interesting features is that it won't die off, because even though the first wave was horrible and clunky, the second and third waves (the MP2000) are still unbeatable.

However, the damage was done, and Apple eventually discontinued them.