I'm always surprised at the pushback from people when the topic of touchscreen laptops comes up. I love mine, even if I don't use it a ton. It's a collection of delightful little things: a modal dialog box that I just reach up and tap Okay. Resting four fingers on the back of the display and using a thumb to scroll a web page. Any situation (like on an airplane) where space is limited, reaching for the screen can be better than using a touchpad. I don't use it instead of mouse/touchpad, but I use it as an additional input, and again, it's delightful.

Apple could let customers launch iPad apps on their Macs and use a touchscreen. But they don't, because they'd rather sell you two devices. It's silly, artificial market segmentation.