A high wattage (input power) doesn't always mean better suction because the amount of this power that's turned into air watts (suction or output power) depends to some extent on the vacuum's design and efficiency.
Lightweight upright vacuum cleaners are more popular then ever. Advances in technologies and designs means you can now get a lightweight upright vacuum cleaner with many of the features you'd expect from a larger model.
The following reasons explain why these vacuum cleaners are the preferred choice for many
If you have a large house to vacuum, or would like to vacuum the stairs in one go, make sure your new vacuum has enough hose and lead length. It's rather frustrating when your vacuum won't quite reach into the corner and you have to go back to the power point and replug into another one.