www.achooallergy.com Fun and easy to use the S2 is the perfect choice for price-conscious, first-time buyers and for those looking for a highly energy efficient cleaner. Being light and easy to carry up and down the stairs it also makes a perfect 2nd cleaner. The Miele Delphi is recommended for low to medium pile carpeting. This vacuum has all the features and performance abilities of the Miele S2 Olympus, but it comes with a more powerful, electric floor tool and a deluxe ergonomic handle. Allergy sufferers can upgrade this vacuum by purchasing a separate Active HEPA filter. Miele vacuum cleaners not only clean your floors, but they also clean the air you breathe.