Dude, I have the same one and it's fine. It's plenty quiet. I have a 175w MH ballast that blows it away by maybe 5x in loudness. It's horrible.

I've dealt with them on returns, at least on my item they preshipped me a replacement, which was totally unexpected and freakin fantastic, and my return was not the 400 HPS system, which I must say is pretty damn nice for a sweet price.

I really should have built a bigger closet.