In the time you take starting and swinging a backpack on you can pick up a handheld and just go. Will a backpack increase productivity so much that I should consider going out and buying one?
Last year I had to start my business with a BG85 because of a tight budget. Bought a Tanaka bp earlier this year and in one neighborhood where I have 3 large properties that take a full day I save close to an hour with the bigger blower.
I still use the hh with a vacuum attachment for a couple properties or I take the whole nozzle off and it works great in some tight places and doesn't blow all the mulch away.