I used this aswell from the start. I got a lot of start up help from my GM who's multiboxing aswell.The only problem is that if i sheep a target on my main and switch to an other mob to fast my clones attack the sheep. But further i love it. I can just switch to one of my 2 clones, let the other 2 follow him and just use the macro's, it doesn't matter.

So if i'm PVPing and Imbest(main) dies, i just alt tab to imbetter and continue fighting, since imgood copies imbetter now.