So I have had a few Creative products in the past, but this one has to be one of the worst of them. Takes several attempts to power on, I first thought it was just that I received a defective unit. But another reviewer is reporting the same issue, so I have to take that as poor design. The navigation of the menu makes no sense. They are not in alphabetical order and you cannot turn any of them off (like you could with some of the previous Zen models). The touch controls respond about 80% of the time, which is really frustrating. My reasoning for purchasing this device was the Bluetooth streaming. Once you get the devices to pair together (takes a bit of coaxing for the initial setup) I haven't had an issue pairing back up. I have noticed that every once and a while the music will have about a .25 sec blank space in the middle of playback. I was thinking it was the device I was pairing to, but when I tried streaming from another device it works fine, so I have to think it's the Zen M300 unit.
Another feature is that you can change the color of the text, red/yellow/white. I initially set it to white but during play back the screen shows music art and then the title/artist over the album art. I could not see most of the text due to the white text so I changed it. The menu changes color but the color during playback is still white. So I really don't get the purpose of changing the font color. The red is too dark to see against the black menu background, and the yellow and white are so similar that it really doesn't show any real benefit.
I'm hoping the next firmware revision will resolve most the issues. So if you are on the fence about purchasing this unit, don't set your expectations too high. It is still functional, the price is good for (considering the Apple unit is almost twice the price) what you're getting.
Having access to Audible is a nice to have, but so far I've been using another unit. You cannot "fast forward / fast back" with this device, so if you wind up missing the last few sentences of what someone has just said you cannot just scan back a few lines, it returns back to the chapter beginning.