For me the form factor is better for any situation where I don't have a table to set a laptop on and my primary task is consuming data. In public transit, in bed, etc.

If I have to enter data tablets are pretty much always out as I hate on screen keyboards and getting an extra one means you might as well just get an ultraportable laptop and if I have a tablet to set something on the benefit to form factor doesn't come into play since I'm not holding the device.