The only negative is that the grills don't heat up completely. In the top oven the grill heats up round the outside and in the bottom oven the grill heats up in the centre. AEG said I needed to turn temp up to maximum but this still doesn't work.
Heat activated catalytic cleaning
The catalytic lining absorbs the grease from cooking and is activated by regular heating to 220°C. The grease residue is oxidised leaving the catalytic surface clean.