There are three areas where ISBoxer excels:

1) useful mouse click and cursor broadcasting (though there are problems with multiple PCs)
2) (semi) Automatic FTL setups (auto in WoW, needs some manual assistance in initial setup in Rift and possibly other games)
3) Configurable multi-step macros/round-robin

Probably the most useful feature of all of this is the FTL stuff. Coming from having to create separate assist macros for each toon in the past, the "auto" FTL stuff makes life soooooo much easier. And it isn't that hard to configure. Try the trial and go check out the guides on isboxer.com and you should be able to get it running well enough to make an informed decision.

And ask in this thread again if you need pointers to guides or helpful links.

Good luck.