You get more experience in gay harem and you level up faster, but it doesn't recharge your energy when you level up. I'm pretty sure it's only recharged my energy one time, but I'm not bothered by it because it stopped saying it recharged my energy when it didn't (it used to tell you it recharged your energy but I think they fixed that). Instead, it will say the merchants have better gear for you, and it will restock the shops. The shops are more expensive but I guess it makes up for it with how much your get for winning arena battles (I've been getting a little over 3,000 each unless it gives me one of the boosters instead). You can also do more arena battles too. I think this one starts you out with like 11 things of combativity, I'm not sure, but I'm up to 15 now. It also costs less to raise your stats. The equipment is definitely better. Oh, and when you fight bosses, it tells you what you could get from them before you fight, and this one doesn't keep giving you things you need for that adventure after you've already got all the ones you need to get through that part of the adventure. It only lets you win 18 battles with each boss per day, but you can get their guys much easier, or at least I know that's how it is with the first boss, I'm not quite to the next boss yet. It only took me like 2 or 3 days to get all the dark lord's guys. Djidane, Dany, and Travis are the ones you can get from him.
I did notice something weird when you go to upgrade Djidane's affection. "There are no men in our tribe. So my friends asked if I could lend you. Would you mind?" I'm guessing that's left over from HH, but it's kinda funny because he's a dude, showing me two people from his tribe who are also dudes, while saying there are no guys in his tribe.
So far it's been pretty good.