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.
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.