ever since stihl has switched from the br400 to the br420, i think the quality of their blowers has gone down hill. every piece of equipment we have is stihl which is 6 trimmers, 3 hedge trimmers, 6 backpacks, 2 chainsaws and an extended reach saw. we got three new backpacks which are the br420's and after half a season we sent them back to the dealer to be fixed. they blew up and had several problems. stihl recognized this and gave us three new packs this year and im starting to think all their new packs arent living up to what they are supposed to be. i dont think the br420 blows as hard as the br400 did, and the new blowers constantly plug up the exhaust ports, the switches have broken on every pack so far, and on one of them, the switch has broken 3 times. im just starting to lose faith in stihl backpacks and was wondering if anybody else has noticed this. ive always loved stihl products, but ive almost had it with these backpacks. the dealer set them up a tad rich when they are new, and now they could probably be leaned out a bit, but they still dotn blow as hard. anybody have any insight?