I've downloaded successfully and am thoroughly enjoying it so far, a refreshing change from the HoMM games that are starting to feel pretty stale (although still good fun).
Some very different tactical considerations here, it's not like the heroes games where you're limited by the troops available, here there's loads of troops available but you can't have too many in your army at any one time so you end up losing a few and getting reinforcements a lot more often.
I like the skill system a lot as well, there's relatively few levels of everything and each time you spend on one of them you get a real, tangible improvement, which I always prefer to incremental fiddling.