I bought this refurbished 8GB Zen Mozaic when the battery life on my beloved Creative Zen became a real problem after six years of reliable use. I use the Zen almost exclusively for Overdrive audiobooks from my library and podcasts and the 8GB storage has not been an issue. The bookmarking feature is critical to me, and the Mozaic's ten bookmarks work great. The speaker isn't high quality, but it's perfectly adequate for those times when you don't want to use headphones. Managing audio files on the Zen using Windows is easy enough. The FM radio works well, but uses the headphone cords as an antenna, so no speaker for that.
The Mozaic is smaller than I expected and very light weight. The larger screen on the older model was easier to read. The control buttons on the Mozaic are small, so I find myself fumbling to hit the right control button. The earbuds that come with the Mozaic aren't comfortable, so plan to replace them at once.