The show spawned 4 animes/specials: Rozen Maiden, Rozen Maiden Traumend, Rozen Maiden Oveture and "Detective Kunkun" Which all have a promising plot but are about as filler as Lucky star when they really need to throw more aspects in for the 12-14 year old girls who watch it besides the creepy teenagers who watch it for "The hell of it, Desu"
The character Suiseiseki shall forever be a an online "fad" as she is constantly mentioned on sites like 4chan and Fail blog, for being one of the strangest characters a show of that genre would have.
Regardless it's worth a good watch if you ever happen to drop your entire life and girl/boyfriend for the internet or such weerbo things. Just remember to pound your head in before hand for the filler episodes so they seem clever.
Guy 2: "Suiseiseki Desu!
Guy 3: "Isn't that show that prissy doll anime?"
Guy 1 and 2: "Yep"