Looking into buying my first gas powered hedge trimmer. Thinking of getting a Stihl brand. So knowing that they have cutting heads 18" to 40" long. They come single and double cutting edges. Standard length. Long shaft for reach. Long shaft for reach and can change angles. The trimmer I will buy will be my only trimmer to be used for every type of trimming job. So I don't think one of those 30" 40" trimmers will be needed because where I do not work in area as the Hamptons where they have miles of tall privet hedges. I think that 24" will be best all around length. I never used one of the extended trimmers. Does the extra length lower the power and durability? Is the extra length changeable angled trimmers have lower the power and durability issues? So based on your work experience what would make a good purchase for me.