I think the alternate upgrade for Inferno is one of the best: just look at the higher demons, turning the second type from a meat-based unit into something amazing; now it's not even the easiest neutral unit of the second type; fire hounds are great, no comment; the only upgrade I didn't like was for the Temptress, because they reduced their initiative by 1, and for example, against Haven, Academy, or Orcs, this upgrade simply won't survive the first attack; the steeds are awesome; the offspring turned out pretty well!
P.S. Major, sorry, I didn't read it! (message edited)