I've also replaced the W7 taskbar at last.
I spend most of my time using the App page. I don't really "flick" much with the mouse. I tend to use the 4&5 mouse buttons instead or alt+ctrl+arrow keys to move around.
I have a page called Work with about 20 programs pinned for quick access when I'm productive. I also have a page just for commonly used document templates.
The issues I have.......
It's not really Dopus friendly like it is with Explorer. This is minor because Dopus still works fine on the Apps page.
There are a couple things I miss. I like having my Zune minimize to a toolbar on the taskbar. I also like the ability to turn a folder into a menu on the taskbar via the toolbar assignment. These are really not minor issues.....right now I'm making due with some changes to Object Dock for the folder access but it requires a few more steps. I find myself having to mute my whole system when a call comes in due to the time it takes to track down Zune in the lists.
I've found the "Web" page to be kind of useless. The only program I get to show there is FF4 and even tho I've made filters for mIRC, Trillian, Sobees, Tweetdeck & Impulse, they still only show on the Apps page. I also haven't been able to get more than the active tab to show in the list.