well, none of these really contradict my opinion that the filter is too big.
I bought one to use around the house. I find that while it is great picking up the dog hair, which is actually my primary use, I find that it fills too quickly. I don't think I am really emptying out that much, based on the size of the collection bowl, which is largely taken up with the filter.
I am thinking about, once I have decided itt has worn out, taking the filter and try cutting it apart and fitting one of those small motorcycle engine pod intake filters to it.