The only one I'v tried is the GO EX although I don't like or have any of the themes I am in love with it. I am kinda anal. I only have 4 windows, My calender is on one, note pad on the other (both full screen) and then I have one that is kinda my control panel to turn off GPS, Sync, Wifi etc etc. Then my home screen is blank with just a pic of my son. The thing I like about the GO is on the android one the picture would move, with GO I can keep the boy centered.
Also on the bottom Doc bar thing with the android there was only 4 slots. With Go there are 15. I have my different app icons some in folders others just single, depending there use.
I also like that I on the window that shows all your apps (not sure what it's called) you can hide apps. I don't like a bunch of icons in my way and have no use to be looking at the Uno app at all, I can make them go away. The only ones I have are the ones I need, like Settings, File, Market and my Uninstaller. Basically it just seams allot cleaner to me.
Like I said I am kinda anal. My computer is the same way. I don't have a screen full of stuff, there either in files or the start menu. I don't want a bunch of icon in my way.