Well, it will certainly sound nicer. Throttle response will improve and overall the car will just power up smoother. There are advertised gains of over 15 horsepower but in reality you won't feel all of that, you will hear it and know it though... so depends on how much money you have lying around for your car.
And the rasp/drone should not exist with any of the higher end systems, SOLO especially since it does have the J-pipes, but I've had no rasp AT ALL with the SOLO cats and the Magnaflow. I'm sure you'd find the same with a Corsa exhaust as it has a similar tone to the Magnaflow. Listen to videos and determine which one you like the most.
Also where in Germany are you located? I just spent a week over there on vacation to visit family.