I'm a fan of the manga, and I have to say I like the manga a bit more, as it paces things better. But the anime is still worth a watch as well, although it doesn't really get good until about halfway through when the plot really kicks in. The manga was much the same way as well, but it handled its time better; the anime-exclusive filler was boring more often than not. [Although I did kinda like the MMORPG episode, at the very least].
I watched the dub, and since it was an early 00s production, it was alright, though nothing too spectacular. Crispin Freeman was delightfully spazzy as Hideki, however, and Sandy Fox and Kari Wahlgren were great as Sumomo and Kotoko, respectively. The two voices I didn't care for a whole lot were Mrs. Hibiya's [at least initially] and Chii's herself. Bridgett Hoffman's Hibiya kinda sounded robotic and forced early on [and she's not a persocom, mind you], but as the series went on, she got a lot better [as is the norm for many dubs]. But Michelle Ruff as Chii...I just wasn't feeling at all. I dunno what it was, I just didn't care for it a whole lot. [She did a good job as Freya, though.]
And of course, the OP is as cute as heck, and the EDs are nice as well, though I have a preference for the second.
Edited by Sangome, 23 November 2011 - 04:43 AM.