I've also owned both; I kept the Zen Micro. Here's my comparison of the two (on riovolution.com).

Maybe it was a Rio ce2100. Black, shiny, small, rounded corners.

I've owned a Zen Micro since February. I got used to the touchpad quickly and now prefer it over a physical scroll wheel. With the beta DRM firmware, it works well with Rhapsody To Go and Yahoo Music. I've had no hard drive, firmware, or headphone jack issues. In short, big thumbs up. I...

Does anyone have any experience with Musicmatch Jukebox 10 and the ZM? Can you use it to transfer music to the ZM? I'm looking for a program that does a better job of managing music versus Creative MediaSource or Windows Media Player 10. I have a three year old version of Musicmatch and found...

Edited: Sorry, scratch this post.

I've owned both the Carbon and the Micro. If you're interested, I just posted a comparison review over here. Enjoy.