Whilst some overhead extractors still have their place, generally they are considered to be a bit outdated and constraining. The vented hobs give you far more flexibility, in terms of getting away from having sharp corners and obstacles at head height, not having to stoop to work beneath them, no steam to block your view or steam up your glasses and far more design freedom. The vented hob allows you to work more socially on islands and peninsulas rather than facing a wall, or even in front of a window.