Unless you use your laptop as a PC, I dont think you really need it.
I'm sure you bought the laptop for mobile.. and thus, carrying around a pad like that along with your laptop would look kinda silly in my opinions. Plus, depending on the type you buy, you might have to set it on a flat surface.
So unless, you use it as a PC, I think you should be okay... but if you feel you need it also, then go for it.