Is anyone using the Stihl 4 mix articulating hedge trimmers? I am looking at the HL100k and the shorter extended reach (HL75K?). I am hearing good things about the 4 mix engine, but these trimmers are a little heavy.....a little over 15 lbs. I'm not sure if I should just go with the Shindaiwa or Husky reqular 2 cycle at around 13 lbs. Who has experience with the stihl 4 mix extended reach articulating head? Any words of wisdom? Thanks in advance.