The Husky 580BTS. There was no comparison to the fit and comfort on my back. The Husky flat out fits me like a glove and was most powerful as well. All the other blowers didn't feel nearly as comfortable to me. I've put 4 gallons of fuel through it now and it hasn't skipped a beat yet. It will crank on 2 or 3 pulls when cold and 1 short pull when warm.
It took some adjusting but I actually like the side mounted throttle handle set up like this:
Side view
Top view
There are a few minor things which I wish were different on the unit such as It would be nice to have an auto return kill switch and I would like for it to have a fully adjustable carb. As for the carb, the unit cranks and runs great even in temps near freezing all the way into the 70's.
I am pleased with my purchase, have no regrets yet and would recommend this blower to anyone needing a unit that's comfortable with max CFM's.