Saw the first episode. I have to agree it feels a bit slow, but the stopping point is perfect as a first episode, so I guess they had to stretch things out a bit and hope for a quicker pace soon. Being dialogue heavy coupled with Horo's accent doesn't make things easier, either.
Koshimizu Ami's Horo was just perfect, I retract all doubts about her being Horo. The accent she put in is just enamoring. On the other hand, Fukuyama Jun sounded too much like Lelouch. I think it'll take me a while to get Lelouch out of my head.
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