Want. Want want want want.
This suit is godly. Material is fantastic, the color is spot-on, and the fact that it is a 3-piece is wonderful icing on the suit-like cake. It's just damn handsome. And being grey it's perfect for the upcoming winter months.
SuitSupply has been getting some really great reviews from the likes of the New York Times and others. The quality of their garments are akin to those of suits upwards of the $3,000 range. So while $569 for a suit isn't exactly cheap, for what you're getting it's an incredible deal.
The fit is nice and slim too with SuitSupply's "Washington Fit" so it shouldn't require much tailoring at all upon arrival (assuming, of course, your order your right size). And a good fit is what makes a suit like this look so good, so you can factor that into the price as well.
If money was no object, you could really do all of your suit/formal-wear shopping at SuitSupply. They offer high quality suits at fair prices, and they sell all the various accessories as well (shoes, shirts, ties, coats, etc.).