Tried it this last weekend for a couple games, played as the centars, angels, and shadows. Centars seemed like the easiest, I loved the 3 move at the beginning of the game and it wasn't that painful later in the game to not have armies moving at mov4. The angels look awesome and I didn't even need to do the special design stuff centars required. Movement really was painful though. I thought they'd get up to speed 3 once I got 3 life nodes, but that was only in combat, I was similarly dissapointed by wing-boost. The arcane attack worked for trained units, allowed my city defenders 3 militia and an archer to kill a wandering flamelord's army- impressive stuff. I didn't appear to work right for my sovereign though :/ The shadows in a fun build, I've made similar custom sovereigns adventurer+betrayers in the past. I love the transparent effect. Too bad in that game I never ran into the companion hero to hire- the 2 previous games I found her but could never afford the 3k gp she wanted to be hired. Some update since I last played last year really jacked up hero hiring costs to you will never have the cash to hire most heroes you find before you beat the game. I also like the idea of all the custom mounts- though why do they almost all have only +1 move (so I don't use them) as opposed to the +2 moves on horses?
I love the idea of longer item description/histories, but the text is so small I can never read it in those tiny popup boxes.