As their MAIN computer.
Let's see....
Has a physical keypad that provides tactile feedback
Laptop: Yes
iPad: No
Can run more than one program at a time
Laptop: Yes
iPad: No
Has a CD/DVD drive
Laptop: Yes
iPad: No
Has USB ports
Laptop: Yes
iPad: No
Sits comfortably in your lap and won't fall through your legs
Laptop: Yes
iPad: No
Adjustable screen angle, so you don't have to bend over to see the screen
Laptop: Yes
iPad: No
Let's see....
Has a physical keypad that provides tactile feedback
Laptop: Yes
iPad: No
Can run more than one program at a time
Laptop: Yes
iPad: No
Has a CD/DVD drive
Laptop: Yes
iPad: No
Has USB ports
Laptop: Yes
iPad: No
Sits comfortably in your lap and won't fall through your legs
Laptop: Yes
iPad: No
Adjustable screen angle, so you don't have to bend over to see the screen
Laptop: Yes
iPad: No

.