Most SCX Rally cars are full working 4WD, all cars have adjustable magnetism so that you can give extra cornering grip to an inexperienced driver and F1 cars have working steering. All these features help the cars corner at greater speeds than other brands.
These cars are 100% Scalextric track compatible, and are a popular alternative to Hornby's products. SCX is so close to Scalextric (they originally, a long time back, were the same firm) that in Spain they're even sold as SCALEXTRIC.