Wow, this is a better episode than the last one, which very graphically illustrates how pathetic the last one was. This is basically a redux of the episode where the 3 blondes want to supplant the Charmed Ones, except that episode was better.
For one, the blondes were far hotter, and frisky to boot. Secondly, both Leo and Chris were around back then. Lastly, and most importantly, the blondes were witches; so the idea that MAYBE they could hijack the Power of Three was at least conceivable. In this mindless plot line, 3 demons apparently can become "the charmed ones" simply by standing in the manor near the book or by looking like one of the sisters and standing with them. If that were the case, then Piper and Phoebe never would have needed Paige to show up to replace Prue. They simply could have picked somebody off the street. Craziness. It is also insane that the sorcerer, somewhat cool as he was, can simply wave his hand and knock out the charmed ones. Who the hell needs the Source, Belthazor, or the Triad when you got this guy?
The last crazy thing was when Phoebe and Paige were being imitated by the demon chicks and Piper (AGAIN) couldn't tell it wasn't Phoebe or Paige even though the demon chicks were being so obvious about not being them that the pizza guy and mailman could tell it wasn't them (I'm joking here). Wasn't it just a couple episodes ago that Piper was killing herself over not recognizing that a sorceress was impersonating Phoebe? Seems to me that it should have been amazingly obvious to Piper by now, but I guess I'm the crazy one.
Still, there was entertainment value to the show, as always, and the final scene where Paige told Henry she was a witch was pretty good. And yeah, it was great when the demon sisters went off on Billie.