Some quick feedback on my experiences with the Zune Pad (SQUIRCLE!)
General Issues
Overall I like the Zune Pad, but I find myself reverting to the directional clicks when I want to make sure my inputs are recognized. I typically use the center of my thumb and as I have large hands I tend to need to use a delicate touch to avoid registering as a click. I believe it is this light touch that is causing some of my problems. I can tell by feel that I am making physical contact with the pad, but it seems many times my actions are not registering. Most often it seems to take more than one flick to the left or right to get the twist menu to advance. Up and down actions seem to have more success, but this might just be superstition?
I really enjoy the feel of the "flick" scrolling through long lists, but I tend to revert to the physical click when scrolling through my massive song lists. I do tend to have issues with stopping the scroll with a touch, but this might be due to my light touch. Pressing the center for "OK" sometimes registers as a directional press so I have to make a concerted effort to press down squarely on the pad.
By instinct I find myself double tapping the pad for the center press. This is of course because of my laptop experience and might be a good addition to the firmware as it is very intuitive (for touchpadders) and would eliminate accidental directional input when wanting to press the center button.
Navigating photos is enjoyable with the Zune Pad, but it appears that changing from an up/down motion to a left right requires a very definite pause before changing direction. It's not much, but noticeable. Zipping around a grid of photos makes me wish there was some sort of keypad (a la XBox) that I could use in this fashion to set up searches or name a playlist. Ideas for the future...
I hope this is helpful information.