The Acer C200 series has been out for a while, but I'm still a bit unclear about a few things. When using the C200 in laptop form, can the screen only be propped up at a certain angle (shown in all the photos) or can you slide it out and in so it will rest at a desired angle? (such as propped straight up at a 90 degree angle) When the C200 is closed, does it only close so that the screen is facing up? (i.e. you can't close it like you would another tablet pc or notebook with the screen facing down)? How is the eraser-head mouse? Is it comfortable to use? How does the 4200 RPM hard drive affect normal use? Is the DVD-R/W drive swappable - can you put an extra battery in instead? Thanks in advance for any answers.