There are so many posts here about backpack blowers that it is hard to know the factual data about them. Since I am looking for another backpack blower, I did some homework and here are the specs of the major contenders in the top of the line blower market. Looking at these, it is hard to believe the video on the BR-600 showing it beat the Shindaiwa EB8510. The Shindi has a bigger and more powerful engine and delivers more air at higher velocity than the Stihl. What gives here? The same fuel weight values are the calculated weight of each blower loaded with the same amount of gas in them (amount equal to lowest full fuel capacity of the panel) and the air volume x velocity index is what it says divided by 1000. These calculated values are there for comparison purposes only. Green and red values are the best and worst values for each specs. As a side note, the Shindaiwa and Stihl are 4mix while the others are 2 strokes engines. I am interested in getting feed back from Shindi EB8510 and Kawi KBR750 owners.