I really like polywire; polytape usually is a problem in high wind areas and we've had problems with the wires burning through where polytape connects to a gate handle or the high tensile wire. Never had any of those problems with polywire.
We use electric cord wheels to take them up. And as Dun, whenever it needs spliced I use a square knot. I use step-in posts about 30' apart and have enough slack that I can use another post to push the wire down to about 6" from the ground to step over it. It has enough tension to bounce back to the proper height, which for us is about 30". We use a single wire to hold yearlings and older. A double wire is required if you need to hold calves. A triple wire worked for us to separate two groups of cows with a bull in each group. In a situation like that, I place the posts closer and put a little more tension on the wire.
Some of our polywire fences have stayed in place for 4-5 years before needing replaced. Other fences are taken up each season and moved. Deer seemed to be a big problem the first year, not so any more. Either they have learned to jump it or I've learned to leave a proper amount of slack so it will have some 'give'. We use Kencove(I think), one brand my husband got at our local Harvestland was awful. The strands of plastic were larger, not formed from smaller strands twisted together. It broke easily, did not mend easily, and was harder to handle.