So my reply (as an owner of a Superb 4x4 280) is in two parts:
1st the car; superb is the word, yes to describe the Superb. Quality interior with plenty of space and certainly in Sportline trim, a modern feel. Lots of nice touches like the umbrella in the door, ice scraper behind the fuel flap. Having had Audi previously it did not feel like a downgrade and it feels a step up from the Octavia I've also owned. Handling is secure and ride is good but it certainly feels like a big car in the corners and lacks precision. This all of course applies to any engine option of the Superb.
2nd the EA888 TSi engine; lots of power, refined and pulls well throughout the rev range. Mostly I drive it like a limousine but knock it into sport and it flies. Fuel consumption is, I guess, what you expect from a 280 BHP petrol, I average around 30 mpg on a run, have seen 40 mpg on a long gentle summer outing, but now in January on shorter trips it will be low 20's mpg.
As many of the official reviews state, it is a slightly odd combination, but for me ticks the right boxes. Buy with your head and the 190 TDi 4x4 has everything except the blistering acceleration.