I started boxing with HKN and used it for a few years, then switched to isboxer/innerspace.
I have to say that HKN can do a lot of what isboxer does, BUT you have to know what your doing and know how to script.
For WOW, is boxer is just great as it works straight out of the box as long as you don't change anything till you know what your doing in isboxer,

I suggest you watch MiRia's video series for beginners https://www.youtube.com/watch?v=jWYUvNGoEQI

if you really want you mind blowing the the pro version https://www.youtube.com/watch?v=cONmD2E69nA

much easier than trying to explain :-)