When it was introduced in 1991, it was one of the most revolutionary designs of the time for laptops, with a trackball between the user and the keyboard. Later PowerBooks were the first with 16 Bit internal stereo and trackpads in the portable consumer market. Nowadays they are extremely powerful, and hold their value quite well.
My PowerBook 100 from 1991 starts in 10 seconds and shuts down in 1 second. Dang that's fast.