Just purchased. Where else can you get a fully loaded automatic for under 16K? Plus the Toyota reliability factor and excellent gas mileage (27-32 mpg under the more strict 2008 EPA standards). The ride is very nice. Handling is tight and the xD's engine is more than adequate (128hp 4 cyl). In comparison, the Honda Fit (109hp) and Toyota Yaris (106 hp) don't come close. There's plenty of passenger room in the interior and the 60/40 split rear seats fold flat for plenty of cargo space. The standard 160-watt Pioneer stereo system with 6 speakers sounds great.The Scion xD offers the little intangibles that you just cannot find in any car in its class.You can't go wrong with the Scion xD.
The xD has a dedicated iPod adapter that you can control on the stereo face. Fuel economy is excellent. I got 36 mpg on my first tank of gas. The xD has a digital display that tracks your mileage. It resets every time you fill up. Love the safety features (6 air bags and ABS), price.
For people like me who love having a center arm rest, Scion will be offering it this fall as an accessory. Other than that, I can't think of any improvements so far. Scion has done very well with the xD.