A guy in the area is selling a used Stihl BR600 blower. Says it's 1 1/2 yrs old, used by his dad commercially for one season & then he's had it in his garage for home use since then. Has some normal wear & tear on the outside but in good shape overall. I'm going to pick it up from him on Monday, take it to a dealer & have him look it over (compression test as well). It's a 4-mix unit which scares me a little given the mixed reviews on here. If I fall in love with it, what do you think's a fair price to offer for the machine? Thanks.