Does anybody have any experience owning or using the SR 450 and if so can they give there feedback on this unit both as blower and sprayer. I'm looking at getting a new blower or good used one and at the top of the line is the spray/blower combo. I mainly need it for 90% blowing and only 10% spraying but even the large backpack pump sprayers only work so well. I always know it's best to have one machine that can do two jobs and to go with quality. Any opinion would be much appreciated, thanks!