We also got a Down-Craft system. Even the most amazing Berbel just doesn't look nice and ruins the kitchen's appearance a little. We decided on the system from Neff. It costs more and there is a certain loss of space inside the cabinet, but since we have an open-plan kitchen integrated into the living area, appearance is very high on the list.
Both systems basically work. Most of the time is spent on preparations and the time at the stove is shorter, nevertheless it is a lot of fun to carry out the actual cooking process with a view into the room. Above all, there are also plenty of "quick" dishes where you mostly stand at the stove, ... pancakes for example ... looking at a wall the whole time or into the room, ... it was an easy decision for us.
Oh yes, the sink is of course also on the island, because preparations are also done there ... In principle, almost everything is done on the peninsula for us, we could have nearly done without the rest of the counter.