Well I have had a few in over the years and i would say they about the same to keep as a Chameleon. They get to be around 2' But dont really think that they can kill a cat. There temperments are a bit on the NASTY side and they are not something that wants to be touched or handled.
They do have the most intence colors i have seen on most lizards by far. But the best thing about them is that they make nice show herps. in a nice enclosure.
If you are interested in some good info on them i will put up a good care sheet for you as soon as i dig it out.
NEW LINE REPTILE
Specializing in Large Pythons
Home of the "GIANTS"