Factory Diagnostic Hardware is nice, but history has shown that experience and inteligence is far better. I couldn't count if I tried how many problems I've seen that "the dealers" couldn't figure out or solve with 'their magic'..
That said, I'd like to have that set-up, but from a friendly dealer that would co-operate in case the hardware or software goes belly up and to provide the latest software upgrades...trusting an ebayer to continue to supply software for 3 yrs (as claimed in the ad) sounds like risky business!
There are part #s for the software and the interfaces in my 99 parts book. I had asked Chad Bolles about them a few months ago and he was able to get me pricing. It was expensive, but nowhere near $23k.
I think if you got everything it was closer to $10k.