Since the Hoover is bagless, you won't have to spend money replacing vacuum bags, but emptying the bin will expose you to dust, which isn't so great if you're an allergy sufferer. Miele vacuums, though pricier than most Hoover or Kenmore models, get lots of praise and are recommended as top choices for users with allergies. Owners argue that these vacuums are worth their hefty pricetags because of their sophisticated filtration systems and general durability. The Miele S4212 Polaris (*Est. $400) is one of the most cost-effective Miele vacuums. Reviewers say the S4 is fast, easy to maneuver (even on stairs), and excellent for removing pet hair.