A search will show that you 2 are the few in preferring the the 570 over the 580.
The 580 just blows more. The swath is larger, the power is superior when blowing/moving walls of leaves/material. The 570 is no doubt the best mow, blow and go mower.
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There are plenty of guys here who agree with ddixon and me. You simply choose to not read them or believe them.
Every single time you get in on one of these BP threads, you start the same crap, and it turns into an argument that can't be decided or ended. Since I started this thread, and it is a simple review of the 570 compared to the BR600, I'd appreciate you either leaving it, or at least knocking off the BS and constant arguing. You won't change my mind, and I don't care to change yours.
BTW- maybe you can't tell how good the 570 is because you are using it wrong.