anyone used an ewa marine housing?

[buddy]

I've picked up a used ewa marine housing - thats the one that looks like a giant zip-lock bag with a glove in it. I'm considering taking it with me to Cozumal. I don't have any information on it, so if someone can give me some advice, I'd appreciate it it. Can I go down to 100 feet without making my Nikon look like a digital?

[dfreeman]

Everything I know about these is third hand and universally poor. Anybody out there that can help with some good first hand information?

Doug