I'm not sure if I'd call it MASSIVE, but it's big. Here's a picture of mine to give you an idea.

http://www.flickr.com/photos/tkamiya9/4307163021/

The enlarger is sitting on a standard sized folding table. You see a Gralab timer for size reference. My safe-light is about a foot away from my ceiling. I understand, there is an XL type that is larger.

I have never measured the weight but it's heavy. This thing is made of steel and aluminum. No Plastic.