I've got 2, both from Sandisk, a sansa clip 4GB for podcasts, and a sansa e280 8GB for my music.
I like the simplisity of the interface, excellant sound quality, but they aretoo small to comfortably watch movies.
I've never owned an ipod as I don'y like being forced to use propriotary software, itunes (Iknow you can use other software from the web), I like to be able to just drag my tunes/podcast to my player as if it is just another storaage device.