I have had 5mm Porsche spacers since Jan of this year when I replaced my 18" Turbo twists with the Sport Techno's. I love the look of the spacers with my wheels. They fill in the wheel well perfectly and look a million times more aggressive then without them. They should also marginally improve handling since you get a wider stance. Click on my signature for photos. 
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2006 Lamborghini Gallardo 6spd-Rosso Leto
2006 Range Rover Sport Supercharged-Winter Beater
2006 BMW 750i 19" Sport Wheels BK/BK-Daily
2005 Lotus Elise Sport & Touring Package-Fun
2001 Lexus RX300-Back-up Winter Beater
2001 Mercedes-Benz S500 Sport AMG-Sold
2000 Boxster S Heavily Modified-Sold
2000 Nissan Altima GLE-Parking Spot Holder
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