Okay so I've been better off, where money essentially grew on trees - I won't go into why but I didn't have to worry about money at all - Fancy sports cars, never cleaning/cooking, traveling, buying WHATEVER I wanted, you name it. I have also been very poor, right now I don't have much money at all.
What I can tell you is that it wont buy you happiness in the literal sense, but it buys you security, and the ability to do the things you enjoy that WILL give you happiness.
I've had depression since 3rd grade and had it even with all that money - I was still depressed.