Crashes as soon as it opens in iOS9 (tested today on iPad Air 2 with the latest iOS 9 update). But no money lost today -- as I could not even get to the point where I do the "In-App" purchase.
I used their older version when I was an iPhone user. I really liked the product I initially bought, and the content was great and presentation was just right. I had that version paired with their "Rogets Thesaurus" product, which gave me the option to jump to the thesaurus from AHD. (I am not sure if AHD5 continues to retain this thesaurus link feature.)
I hope these guys will hire someone who knows how to program (and when to stop programming), and release a stable product. Even with their old product that I used, the instability gradually got worse as they made more and more tweaks. If any of their guys are reading it here is some "Free" advice: Stick to minimal features, and minimal iOS/Device capabilities. Simply lookup a word and display the god damn meaning!! How hard is it to get that right??
CliffMathew about American Heritage Dictionary, 5th Edition, v6.2