For me it's
A dyson dc28 or a Bissell pro heat 2x for the most hated. Most dysons are a pain, though iv gotten rather good with the 7, 14, and 17. Rainbows don't bother me too much anymore, but the d2 and d3 I still try to avoid. Give me a sanitaire or electrolux tank any day! Kirby's aren't...