2 things are but who with me prevented a maximum number of points.
1. The suction device is not effective. Despite powerful Kärcherstaubsauger the wood chips / dust are insufficiently sucked.
2. The riving knife or the holder thereof are not sufficiently fitted precisely enough. This means that in longitudinal sections, the wood easily jammed and that no clean cut is possible.
I had to adjust the riving knife new that to make the longitudinal cut quality reasonably.
2015 .... after prolonged use:
The circular saw blade was also inaccurately adjusted (not exactly parallel to the table - which was recognized by the "black" Woodcut surfaces). But I could (turn table, remove the plastic cover, remove 4 screws of the guide carriage and realign) the guidance of the saw blade to realign, so that now parallel cuts fit again. Now the wood cut surfaces are again like the way they should be ...