well saying something is "tech" just because you said so, or someone else "said so" is BS...along with the line that Stihl tollerences are so tight it changes the way to run in a combustion engine. Put up or shut up.
Back to the posts: From what I have seen out west from where I am, 40 years would be a good run! The ground conditions and weather play a huge roll....along with the beast that are contained within. Cypress, which is known to be very termite resistant in domestic construction, due to natural chemicals, doesnt last much in the ground, rot and termites win. They even use Gidgy on my mates property, but time always wins. The other determining factor on the larger properties is what is actually growing there and is suitable for posts.
most fencing I have seen is the good old star picket with say 3 plain and 2 barbed. Easy to put in the ground with a counter balanced jack hammer hanging off the side of a ute (pick-up) strainer sections done in gal rhs or shs.
when I went to watch the CS races at Crows Nest, and I saw the post rip, I said the same thing as Will....and that was from the sidelines :hmm3grin2orange:
saws over here are only getting faster now and there is even one on its way over from the Good ol USA built by Dennis Cahoon. That will put a cat amongst the pidgeons