Do I need a surge protector for my macbook pro

I just got a new macbook pro retina. Do I need a surge protector for it? Will a cheap one from walmart do? I have it pluged up with the power brick into the 3 pronged cord that came with it. I unplug it from the wall whenever there is a lightening storm like last night. Do they really even work?

It's better to be safe than sorry as my fater would say ;) I always use a surge protector and prefer Belkin but I'm sure anything is better than nothing!

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