I recently traded in my 2005 Mazda3S HB and got the Speed3 three days ago and this thing is unbelievable. It's totally a different animal than the regular 3. The turbo adds so much and the suspension is awesome. It corners like you're on rails and the stock Bridgestone Potenzas are way better than the stock Goodyears on the 3. The exhaust is much better too, it sounds mean. This car just begs to be driven fast and I got the red one so it's a cop magnet, but oh well. I think it's the only color to have with this car, it makes the black accents really pop big time. The MPG is about the same as the 3 too, which is awesome. If you are looking for a car in this class, go get an MS3!!
Power, the sound of the exhaust, the interior design, handling, did I mention the power?