After reading many many articles and testimonials, I decided to try copper bolusing *some* of our goats yesterday.
We have 6 Saanens from two different farms, one is black and brown (either a sable or a black goat slipped in somewhere among her ancestors). Rough coats, hair falling out too easily, and the black one's hair is curling and turning brown on her thighs. This just started this year, and I'm guessing it's because they've eaten most of the deep rooted browse down and are mostly on shallow root stuff now. In addition we have very high iron content in our water, so I decided to take the plunge.
OTOH our nubians look great, our black one is sleek and shiny, no discoloration at all. This is the only reason I'm skeptical. If it's copper, then could the breed make that much of a difference? So I only did the Saanen's yesterday. If it doesn't kill them after a month or so, I'll consider doing the others.
All I did was open a 12.5g Copasure capsule, dump out about 1/3 of the rods, put them back together, and stick them in the bolus gun with some peanut butter. The gun ($1.29 plastic one from Jeffers) was so long I couldn't reach to the end of it and control it and hold the goat's head at the same time. So I positioned the end of the gun and had a trigger-puller/post-op cookie-giver helper (my mother).

Some of them are probably going to have sore throats today because I just meant that they weren't going to spit them up.

They are still alive this morning.

I guess the old hair will have to fall out and new hair grow back to replace it before you'd see any differences, if that's the problem, right?
Since this seems to be a hot topic, I just thought I'd add my experience.