I have a Dyson that I have had for several years. I clean the brush every time I use it - cat and dog hair along with mine. I also wash out the parts that can be washed once a month and let them dry overnight.
Prices have come down on them from what I have seen at places like Target. I paid $500, they are now around $300.
There is a Shark that is very close to the Dyson now that is around $200.
Never loses suction etc.
I have had many different brands, most do not hold up like the Dyson does for me.