In a rare moment, I somewhat disagree with Pointdablame, although I haven't used one. The basic board has full functionality and is a great value if you don't mind hacking an IDE cable. The harness will likely tend to either have wires shorter than you need or longer than you need, and when you add the cost of the harness, you could buy a standard I-PAC or KeyWiz and a mouse hack.
But that's really a cost/convenience issue.
Actually, I should have mentioned that I used one in a bartop, and plan to use my next one in a bartop as well, so I never had short wire issues. Long wire issues are easily solved with some wire management IMHO.
I will admit that with the wiring harness, its not a great deal dollar for dollar. However, the ability to wire up the panel in five minutes flat made it worthwhile for me, as well as the fact that the board itself is TINY.
And I still like ya Tiger, even if you don't ALWAYS agree with me
