Hi, this is my first post. I'm not a landscaper, just an homeowner that need a good system for my lawn and ceder hedges. I have to trim some 50 feet long of ceder hedges that are at least 10 feet high that where never trimmed. The other hedges were trimmed before. I own right now a Stihl FS38 that I will sell on the internet. I just want to buy a good system now and not make the mistake of getting low end stuff but I don't want to overspend on professional stuff if it's not needed. Anyways, I am looking at purchasing an attachment system like the PAS, Kombi or others. I was looking at: Stihl, Echo, Shwindaiwa, Redmax, Husky and Tanaka. I have a few questions: I heard that it's better not get a hedge trimmer that the pole is too long? Is the Stihl KM55 motor head good or it's too low end? Paying extra for a solid shaft and bearing drive, is it worth it? What about 2 rings piston? Carburetors, What is the difference between : A) Walbro diaphragm B) Walbro WYL barrel valve carburetor for all position use, and excellent throttle response and fuel metering throughout entire rpm range. Does the Echo PAS system comes with a solid shaft and bearings? Does the 4 mix and C4 really more heavy then a traditional 2 stroke design? Thanks for your time.