Sorry guys...my SH-85 (the shredder-vac model of the BG-85) is just value-engineered junk.
Starting with the vacuum tube--it's undersized for the fitting, and the blower vibrates so incredibly badly, the tube falls right out. Never takes more than about 30 - 45 seconds. I have to duct tape it on in order to make it stay put.
The blower starts fine, but has to be continually nursed in order to idle until it is well warmed up, and even then it idles poorly. Been adjusted twice now by the dealer, he says "They're all that way."
It accelerates very poorly as well. And have I mentioned the vibration? Even wearing anti-vibe gloves, it is seriously, seriously uncomfortable after roughly three to four minutes. My hands will just sit there and buzz for an hour afterwards. I used it to vacuum/shred some leaves last week...ran it for roughly thirty minutes. My hands hurt so badly that simply tapping one finger against another shot pins and needles up my arm.
And I was warned about this, but the bag is much to small to do any real leaf collection at all. I was constantly emptying the bag, and the Stihl value-engineers didn't see fit to putting a decent-sized slider on the zipper, so you have to take off your gloves to empty the bag.
My electric Toro beats the Stihl in every single way except the part where I have to plug it in. Then again, it is a Toro, and I would expect that to be higher quality than the Stihl.
Stay away from the BG-85...it's junk.