As you move your way up the Dyson ranges - from V8 to V15 - you will see improvements in suction, run time and dustbin size. You will also find different models within these ranges, their names represent different included accessories, such as 'Absolute' (Includes Soft Roller Cleaner Head - for hard floors), 'Detect' (Includes illuminated cleaner head) and 'Outsize' (Includes a wide, high-torque cleaner head)