It really is difficult to emphasise just how fantastic these football boots are. Alongside the hard ground version 'Copa Mundial' (which has chunkier moulded studs), Adidas' World Cup is testament to a design that does not need reworking.
I feel it is the responsibility of any parent to introduce their son/daughter to a reliable boot; one that is going be comfortable for 90-minutes, protective and perhaps even modest in appearance. The World Cup more than meets these attributes, and that is why they have a legacy.
The kangaroo leather is one of the softest I've ever felt on a football boot, and this provides a significant advantage for controlling the ball as it is so supple, unlike synthetic materials. The outer sole is flexible enough to give in to normal pressure when running, as opposed to the modern-fad of stiff soleplates that place more pressure on your bones. The insole is like wearing a slipper and will over time mould to your foot shape - though be aware that the fit is quite narrow.
As with any leather boots, it's good to teach yourself the discipline of thorough cleaning. Even if you don't intend on wearing them for an extended period, give them a wipe with some dubbin or leather food once a month and you will be amazed at the results. Whereas 'plastic' boots crease and even crack, the World Cup's are resilient and healthy.
Should you have wide feet, I would first consider Puma's King Top boots as these were surely designed by a duck. Other than this, I simply can't recommend another football boot highly enough.