An excellent, little media player. I have an SD card I use in my PDA/Navigator and this works brilliantly with the Zen. Although media functionality is limited on the SD card compared to that stored on the actual Zen itself, this doesn't really impinge on the usefullness of the SD slot. I have several full length films (that I own) converted to 320x240 DivX on the SD card ready for long, boring trips and they work perfectly - if watching films on a small (albeit sharply defined) screen is your bag.
The sound quality is very good, especially with a pair of noise cancelling ear/headphones (purchased seperately - also Creative). The earphones that come with it are typical Creative Labs quality and therefore quite good, but they don't fit my ears that well, which is probably more to do with my freaky tabs than the 'phones.
Browsing the menus takes a while to get used to but quickly becomes second nature and uploading to the player is simplicity itself. One point however is that to upload to the SD card, one must set the Memory Card to an upload mode before plugging the player into the PC but once you know this, it isn't a problem. The player also displays images really crisply and this is a nice little addition to the feature list but not something I would specifically buy this for.
The hardware looks shiny and smart - a simple slab of piano black darkness. Also, mine came with the very latest firmware on it which was a bonus. The software however was out of date but that's not a problem as the Creative site is easy to navigate.
All in all, a brilliant piece of kit. Once again, Creative Labs hit the spot. My iPod loving friend even commented how smart it looked and how the SD slot was a good idea. He still likes his iPod better but if we all liked the same things it would be a very dull world.