I have the goat panels as my "permanent" pens. I also have 4 strands of electric fence connected to the panel pen as pasture. The galvanized aluminum wire was the most expensive but very easy to install on the fiberglass posts. I also have an insulated "underground" fencewire to connect the fencer to the 4 strands without electrifying the panel pens.
It was actually more of a pain in the butt to clear the area for the electric fenceline than what it was to install it.
With the panels, theres no need to clear a fenceline, just drag them to where you want them, put a few t- posts in the ground for support , I use dog swivel snaps to connect the corners of the panels..cheap , easily removed and they work very well.
Panels are 16 feet long as Stacey said, 4 square is enough eating for mini goats for a day or 2, If you go with 6 or 8 panels, theres plenty room for 4-5 standard size goats to be able to eat as well as avoid the areas they poop on.