I really don't want to talk badly about HKN. I am truly thankful for all the work Freddie put into it, and I had lots of fun configuring HKN.

I'd rather just talk positively about ISBoxer. The mouse broadcasting is amazing. The PiP swapping is amazing (yes, I had both of those implemented in HKN, but the way ISBoxer handles it is superior for multiboxing). I love the macro generatino in ISBoxer that allows me to mix and match my teams easily. It takes about 25 seconds to add a new macro to all my toons, which includes FTL modifiers, and can be done on the fly. It's extremely easy to go from 5 priests to 3 druids a priest and a warrior, since all the macros are generated when you load up WoW.

HKN can do everything ISBoxer can from a broadcasting standpoint (though ISBoxer is better at some things as mentioned before). But HKN isn't customized for WoW, nor should it be given Freddie's goals. ISBoxer is customized to WoW (and other games) and has features not available in other software I've seen.