Final Fantasy XIV Database - Ffxivpro.com

I won't argue that FFXIAH gives an unfair advantage, as it does, but there are subtle differences between the two. FFXIAH is client-side independent from FFXI, having an account on FFXIAH cannot get you banned in-game. Having Windower can.

Being in FFXIAH doesn't necessarily mean you're being unethical. Frankly, FFXIAH is nice, but I don't bother even looking up prices. I don't AH much, and when I do FFXIAH really has no say in the matter, I deal directly in game. I come to FFXIAH for the community, and for reading at work.

So in a sense, using a metaphor, I "downloaded" windower, but I'm not even using it.