Bitcoin mining

Hi there!

Yesterday i chose to get into mining, and i have been reading some about it. I'm slow but surely getting the basics of it, but i'm not 100% into what kind of hardware i takes...

So here is the question:

Should i build a computer with 2-3 graphics cards, or would i be better of with this: https://products.butterflylabs.com/25-gh-s-bitcoin-miner.html

And would it pay off? Or is it like throwing money out the window?

Thanks!