I as well had a game sponsored through Mo from MoFunZone. From my experience he was fine, maybe a little different than other sponsors, but different doesn't make him worse.
MoFunZone ++++
Really communicates to you as a person rather than a machine. Laid back, has experience, has good looking branding materials for your game (e.g. preloader, site button). His one downfall is that he is controlling. Personally, I am a take charge kind of guy so it was hard for me to say Okay to all of his orders, but it wasn't impossible, and it paid off in the end.
Seriousness++++
He runs a website for games, he sponsors games, he takes pride in what he does. He has a knack for being casual while productive which I find to be a good thing; I don't like to picture my sponsors as big business men in ugly suits.
Money+++++
Excellent money especially for such a small game. When no one else would sponsor my game, Mo was there to offer me more than I originally expected. Another plus was that he paid me on the spot, before the game was even on the web.
Efficiency++++
Since most communication was done through instant messengers, it only took a few days to get everything settled. He lost one plus because his manner of doing things may seem foreign to those who have sponsored through the bigger names.
Social+++++
Pleasant to talk to. I still chat with him every once in awhile about the flash scene.
Overall
I don't know if I would sponsor a big game through Mo just because if I'm holding the game close to my heart, I want as much control as possible. For small games I would definitely go back to him. Great money, and quick sponsoring make for a winning combination for mini games.