A:AnswerDoes the filter need cleaning? I would start there--let it dry completely after washing it out, too. I think mine started to 'wheeze' as you say after I rinsed my filter, but it wasn't completely dry yet.
A:AnswerI have wood flooring, real oak flooring and it works great and has never scratch it. The roller brushes are soft yet pick up all the dust and dirt great.
A:AnswerPerfect for floors. I have 6 pets hair for days. Picks it all up in a minute. The attachment to use on sofas is great. Easy to put together and easy to dump, no bags