Now that I've looked over the Sansa...sadly the WiFi connect is the only thing that they seem to have done right :
4 GB? I don't care if it has an expansion slot. With subscription music, you're gonna fill that up. I have about 9 GB of files on my Zune. Some of that is video but I add music all the time.
Which brings me to the video? No video? Forget it.
And here's the dig about the WiFi. The Zune should have this. But on the other hand...at work, where I use my Zune all day I can't access any WiFi networks. They're secured. There is only one place where I have access to an unsecure network. My house. This has to have an open network. Um...yeah, good luck with that. That's about useless as the Zune WiFi.
All of this sounds good but I don't think its going to work well in the wild. As a model though, its a good one that should be improved on.