Hi there, this is Krystal with Dyson. Thank you for taking the time to leave a review on the Dyson Big Ball Canister vacuum. I am pleased to hear you are satisfied with suction. However, I am sorry to hear that it did not work well on your hardwood floors. This is very unusual to hear due to the great suction power it has. Also, please rest assured, Dyson machines are made from polycarbonate ABS which is the same material used in riot shields and crash helmets. We subject them to 50,000 hours of testing and 550 individual tests. All of this to ensure they can withstand a lifetime's hard use.
You may view a short video of the testing process here:  http://bit.ly/1lhNOt0
We understand that you may have already returned the vacuum. However, we would value the opportunity to learn more about your experience. Please contact us at askdysonUS@dyson.com with your serial number, description of issue or concern and your contact information and we will be happy to help.
Dyson Customer Service