Who needs a radio? I haven't heard anything good on the radio in yonks. It's all mainstream pop and hip-hop tripe. The only good things they play are the classics, and since they are *classics*, I already have them all ripped...
I haven't used a Gigabeat for comparison, but I lesser-than three my Rockboxed iPod 5.5G. I find the scroll wheel very convenient to use. It's one of the slowest targets for video playback (not counting the Apple OF), but it's still completely watchable at 12 FPS fullscreen.