Keyboard hacks tend to produce ghosting. Basically if you press a group of keys than it can cause another key being pressed. Also the Setup with the Ipac is easier since the thing is programmable and basically built from the ground up for mame. Also there is no soldering/splicing and such involved. You plug the ipac into your usb port, then wire your buttons into the Ipac.
Ghosting as previously mentioned can be a problem.
Having an I-pac also allows you to have a keyboard connected to your cab without having to swap the cables over. I've found that a wireless keyboard is invaluable on my cab as I run a lot of non-emulated games which require different keys.
Also they are just generally neater and hence less likely to go wrong. Saying that I ran a keyboard hack for a year with no ghosting and no problems whatsoever.
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