I have a different opinion
I had a shark rotator for five years, never had an issue with it. The filter didn't require nearly as much cleaning as people say, the filtration never showed any signs of leaking even as I vacuumed up fine carpet cleaning powder. Never leaked any carbon dust either. The noise level was also less than that of most dysons and other modern uprights, it is clear they put a good ammount of noise reducing insulation into it. There was no high pitched whine to it, although their smaller machines such as the rocket are fairly noisy.
I have also extensively used the newer shark powered lift away in a neighbor's home. They have a busy house, and the filters are rarely washed. Yet when I went to use it I was still impressed with the performance even with filthy filters. I was able to clean the entire house with no noticable drop in performance. Not to mention after two years in a large family home, and with little care, it is still fully functional.
Oh, and on the latest duo clean models all you have to do is press a button on top of the power nozzle and the brush roll lifts right out. No tools needed, and the brush can be easily cleaned.
I think for the features and versatility they offer, for the price, they represent excellent value.