I quit using laptops. While the size is nice, usually the plugs and everything required make for a larger unit than an atom based board. However, if you have a laptop, go for it. I squeezed an atom motherboard, PSU, and HD into a 18" Galaga bartop. Overall, it was a smaller footprint than the laptop.
The other thing I don't like about laptops is they usually don't allow you to power on automatically after the power is turned on (AC Power Loss). They require you to hit a button. Not a huge deal, but right now I flip a light switch and all the arcade games come on and I like that.