I've recently been in here twice in the last two weeks and have only explored half of it. It's pretty awesome in my opinion. Excellent graffiti, cool industrial parts, and good exercise (there's some climbing involved).
Please take note that there are many squatters there. One floor had about 10 "beds" on it. So it's definitely not cool to explore their home at night with flashlights. Only go in the day time and with at at least one other person. I only encountered one squatter, he was too wasted to do anything so my friend and I ignored him and carried on.