Having watched DearS before Chobits, I didn't think of it as simply a Chobits ripoff, like some other people do. If you liked DearS though, Chobits is for you. It has a similar plot, Ren and Chii are nearly interchangeable, but Takeya is a little more apathetic than Hideki, I think. Chobits has a more solid progression of events, and its 26 episode format helps it contain more details. It's up to you who is cuter, though: Ren or Chii? I can't decide!