I thought to bring this video here, because result was quite shock for me. Of course I knew that the straight suction isn't the best way to get carpet deep down clean, but difference is huge. Also powerheads had a bigger difference than I thought.
All vacuums in this test had almost empty bags/clean filters. Also suction differences were quite small.
In the link is the original video.
[MEDIA=youtube]x4YRx9CpkV4[/MEDIA]
[URL unfurl="true"]http://https//www.youtube.com/watch?v=I9fTrONqXOY[/URL]
