I have a new br800 which is a warranty replacement for one that bit the dust due to a pushrod coming out of socket and tearing up a bunch of cam area stuff. To me, the biggest reason to shun the 4-mix blowers is the cam being located in a very labor intensive area. I find it advantageous to view the cam from time to time... Impractical with a 4-mix blower. But... I really like the br800 otherwise. Prime 5 times, squeeze trigger 8 times, starts on first pull every time and runs great. If more power is needed Stihl does not have a blower for that