We have high tensile, but you have to have it installed CORRECTLY or can be a problem. Ours was professionally installed for horses, using 8 strands. Bottom two are hot, skip two, hot wire, skip two with top wire hot. For lots of sheep, I would probably make that 4th up wire hot as well. Lesser amounts of strands allow heads thru the wires, won't bounce the animals back if they hit it, like a quantity of wires do. Not sure of the recommended strands for sheep. Cattle have 14 strands recommended in heavy use areas like barnyards and sorting areas. Ask the experts, and your local farm store folks ARE NOT experts!! Call a fencing installer to ask questions!!
All our corners and gates are double braced, because wire is UNDER TENSION, pulling all the time. One brace does not hold up over time and big gates to get machinery thru. Posts are DRIVEN into the ground with a machine, have held well and stayed firm over years. Saves a TON of time and work, that machine just WHACKS them in fast. The quantity of posts installed in a day is amazing, takes longer to put the wire up than the posts.
I LOVE the high tensile wire fencing, would certainly install it again if we needed to fence something. It holds our lambs in pretty well. We do shear them so they can feel the bite of fencer, get wary of the wire and don't push it. Paddocks are big and open for the horses, you don't overload them so animals are crowded into the wire. Crowding, horses or sheep, is when accidents happen.
Yearly maintenance involves ME weed whacking under the wires to keep weeds and stuff off the hot wires. Yeah fencer will burn grasses but you waste electricty frying weeds. A clean fence lets you see if there are problems, is more visible to the animals as a restraint. Clean fence allows it to be HOT, animals don't challenge it. Fencer is ALWAYS left on to keep things safe, don't try to "save money" on electric. Vet expenses will use up any "saved money" when animals get hurt in the wire grazing thru or playing in it! Fence will pop some staples as the weather changes, wind blows. I just walk fencelines and put staples back in if needed, check insulators are in place. Easiest care fence I know of!
You do hear about tensile being a "problem" fence from folks. EVERY story I heard and asked questions about was tensile that was installed wrong or not kept up with fencer, over crowded condtions so animals got pushed into that bad installation of wire. Often hung on T-posts (less strong) not wood, use only 3-4 wires, fencer is not working for various reasons. Then you see 4-6 horses in a paddock the size of a small backyard fighting over food, one gets run into a corner and gets fence injured badly on wire.
We had a couple injuries on horses over the MANY years of use, stupid things on our part. Allowing horses to have only one line of wire to divide them, got in a fight over the wires. Lightning hits on the fence fried the fencer twice, horse grazing thru. I SHOULD have been checking fencer more often. MY fault. We do things DIFFERENTLY now, walk by the fencer daily, to check it is on! I consider our fences very safe, and the fence accidents are WAY LESS than other fence types among my horse friends. 6 I think in over 25 years, which I would call a good record. No sheep accidents in the fence, but we only do summer lambs for 4-H. Calf and heifer were very respectful of the fence, but she did test it being hot with her whiskers! Having many strands, my tensile is also a physical barrier if power SHOULD go off in a storm. None of the animals are going to walk thru the wire to escape.
Deer have pulled some wires down when horns got stuck or many deer tried diving thru. Not difficult to repair, mostly just putting staples back in place. I purchases some fence flags, plastic markers, deer seem to now avoid that fence.
For us, the cattle farm we first saw high tensile wire in action, installed correctly and used properly, tensile is an EXCELLENT FENCE in all regards.
So paying for a quality job is worth the expense, you don't have to keep fixing fence they get tangles in, boards broken or deal with Vet costs of injured animals. Our fence installed, was less than the cost of materials ALONE, of doing woven wire. All the install would have been our work and time. Of COURSE I went for the high tensile!!