I started looking at wheel spacers after some of my friends started buying new wheels and other cosmetic modifications. I wasn't ready to fork over the money for new wheels and tires when my existing factory ones were brand new and still looked great.
One of my friends pointed me in the direction GarageLine. These spacers are of solid construction and half the price of others on the market. I have no regrets going with a square 20mm setup as it leaves the wheels nice and flush with the factory fender without the need to pull or roll. Naturally, I don't really recommend wheel spacers if you are in a position to buy the proper offset wheel, but I can't deny that sometimes making a sacrifice for the sake of appearance isn't entirely out of my wheelhouse.