It's legal.. I've been using it alot. Blizzard has even confirmed the legality as long as you play on 4 accounts and, as mentioned before, relay your actions to the other ones. They don't even frown on the use of lootalert in conjunction with isboxer.
Thats a permban right there mate. Dont listen to this looser.
Sorry, but you look like someone who has no idea what hes talking about right now
It's okay though, can't expect everyone to know everything :), but yeah, its legal to multibox in blizzard games for years.