I never played until it went free to play, but I had a blast with it. I was too cheap to buy membership so I was forever stuck in that first world, though. My friends bought membership, and I remember going to one of their houses and being blown away by all of his loot.My friends would visit the first world to play with me sometimes, and I couldn't tell you how many times we beat that spider boss or played the Maelstrom horde minigame together. I remember the day it was announced that LU would be shutting down. I was pretty sad, but my friend was so crushed he cried. It was not a happy day.
Another friend said that he and one person from every other faction went to a special location and got transformed into the faction leaders. He, being part of Assembly, said he could now play as Doctor Overbuild.
We totally believed him.