I am looking to replace my junk troy bilt combination unit because I am tired of working on it every time I need to use it. For attachments I need a straight shaft trimmer and a pole saw. In the future I may add a edger attachment. I have 19 acres and maintain 6 as yard. It will be used weekly for around the house, shop, trees, pool, and pool house. Every other week I will use it to trim around the pond (1.5 acre) and along the front and side fence lines(900') and front ditch (300'). of the yard. The trimmer will be used twice a year for taking care of low branches. I was originally planning on getting a stihl since I have two stihl saws and have not had any problems with them. I was going to get the KM90 for the power head, the straight shaft brush cutter and add the spool head to it for trimming, and the pole saw for limb trimming. I am starting to lean away from the stihl because I have heard mixed reviews of the 4mix technology along with the added weight. I think I may go with a true 2 cycle. I am going to check out my local redmax dealer today to see what they offer. I know tanaka offers a combination unit and I have a tanaka dealer about 30 minutes away but they are a pretty much unknown brand around here. Am I over thinking the 4mix or are my concerns valid? Are there any other brands I should look at? I am planning on making a purchase in the next couple of days since my other one is out.