I don't have Legend either... I stumbled upon AP in a store with a pretty attractive price, being a HoMM player (have all except chronicles), I bought it.
Then I found out it has online activation.
I'm fine with disc check DRM (that doesn't cause problems, e.g. SecureROM not StarForce), but I hate online activation.
I heard that AP's system is a lot better than Legend, so I'm okay without it.