I bought the creative zen vision M about 5 months ago and it has not let me down once. The battery life for it is amazing its about 4 hours for video and 14 hours for audio playback. The quality of music is high and the resolution for the video is also amazing. Watching a video of it is amazing and the screen size of 2.5 inch is perfect.
As for the size of it although its not as thin as the Ipod video it isnt exactly huge infact it fits nicely into the palm of my hand and doesnt weigh much either.
30gb is enough even if u have a vast collection of music, videos and pictures you want on it. I would advise people to get a charger for it so you can charge into the mains socket and an AV cable so u can watch videos and listen to music from ure TV. You can buy these together of Play.com for about £30 i think. But its not a neccasity to have them
Would extremely recomend to any one who preffers quality and style over just the style of the Ipod