Not bad for a sequel written in the P&P universe. It takes one of P&P's most unpopular characters and makes her more interesting. She's the same Caroline Bingley, but fleshed out a bit. The author even gets to throw in some of the feminist issues that P&P deals with.
The only thing I didn't care for was that the whole romance/marriage she was after feels like over-manufactured karma. She gets caught in the exact same position she put Jane in, in P&P... it was done decently, but something more original would have been better.