Me and my helper think the same thing. I understand the specs. Like I said, the difference is with the volume.
And on the subject of BR 600's it is a good idea to remove the impellar once every season as they rust on solid if you don't
Out of the 5 I have repaired we ended having to cut 4 impellars off which at $ 90 ( AUS ) a piece becomes very expensive.
I'd rather buy a new blower. If it lasted me five years and the engine needs to be pulled off, probably cheaper to buy a new one on the long run.