I have the Storm, why would you want too take it upstairs, you can run up to 150 hose off it. That being said flats are a different matter and yes they are a little bit heavy to lift. I don't do many flats and have done one since I got it and the landlord was a really good bloke and helped me up two floors but I got it down on my own, never again though. Previous to the Storm i had two other machines and although easier to get up stairs they still presented a challenge. If you think you might be doing flats on a regular basis I would look at getting a smaller machine for these jobs. The Storm is still the best machine I have ever had, it is my third.