I have a Philips 6gig. I have had it going on 2yrs and use it almost every day. The batt. life is GREAT, at first it would last 13hrs non-stop...even after 2yrs it still lasts 8hrs or so on a single charge. It is about the size of a ipod mini but about twice as thick. It also has a disk that instals a toolbox on your computer that searches for program updates or if for some odd reason it would crash it can re-install the system. As far as locking up...it has a forced shut down that re-boots the thing, I have only used it a few times since I got it. You can choose the specific model as a drive or as a file. Songs just sync. from windows media player.
It is Windows based and also can hold pics, has a built in mic. and FM radio. My buttons on the side (the main window return button thing, and now the volume is getting alittle touchy) are getting tired...but like I said I have used it almost every day for going on 2yrs now.
My model was replaced with a 8gig for the same price the last time I looked. The front face is a touch pad that is backlit with blue light when you touch it. The screen is about the size of the ipod mini so its small. They did offer a larger 30gig (again 2yrs ago when I got mine, so a larger model may be out) that was like the 30 and 60gig video ipods as well.
I was looking at maybe replacing mine as really 2yrs...is a long time IMHO for a thing like this. I found a Zen that was a 6 or 8 gig that was small and cheap...I was going to get a Zen when I got my Philips but liked how it looked and its setup over the Zen.
I got the wife a San Disk Sansa for Xmas and its nice too, I may get one of these for myself as a replacement as there are a good bit of acc. for them. A big plus is the expandable slot on the side for added memory on a mini SD card. Our cell phones (samsung sync) also take this same card so we could use it with our phones too.
***just checked philips website, it looks like the whole line has been re-done as I cannot find my model***