From Ars Technica:
…a pretty surprising statistic: 96 percent of iPad owners also own a laptop…
researchers have been tracking it, alongside other tablets, to figure out what we actually use them for and where. In short, we use tablets almost everywhere we don’t use laptops, or where we would use laptops in an absolute pinch but would prefer not to: bedrooms, living rooms, bathrooms, and kitchens.
My take is that tablets are for entertainment and laptops (or desktops) are for creation. That is productive work. Most people will read a novel on a tablet but very few people would write a novel on a tablet.