Their $150 unit has a 4 star rating. Others of theirs were viewed very low. Have a new neighbor that is fixing to get one. Fencing 2 acres, ground wire, grounded at every post (4' steel hot wire or T post with paint removed accompanying hot wire), 6' ground at unit. We'll see.
On insulators, they have yellow for line posts and black for corners. 14 AWG wire is what I found works best for me.
On your 1.2 Joule smack Vett, that's a pretty good whack. I would imagine that the solar units are light dosages considering the efficiency of solar panels. Course, my experience with hot wires is once they get smacked they stay away. Had another neighbor with about 50 acres fenced with one and it was only about a foot off the ground. Never saw that before but the grass was clipped nicely on both sides (by them) but the cows were on the inside.
I used to test mine with a stem of Johnson grass. Start out at about 10" and push forward till you felt the tingle, realizing that your boots were insulating you, or use my knife blade on a steel post and jump across to it.