Love, love, love my Dyson DC14! Only time it ever lost suction was totally my fault. I'd been using it for WAY too long without cleaning the hair off the beater brush. (There are 6 women in and out of our house, all with long hair, plus 3 dogs and a cat.) Also needed to clean the filter out which consisted of taking it out and beating it on the ground outside.
Dysons rock!