I'm using it with DD13, and while I can't say that I love it, it has worked better for her than any other program we've tried. It's a fairly straightforward, high school level program with a good mix of speaking, listening, reading and writing. Since it's a British program, it emphasizes Castilian Spanish rather than Latin American Spanish. This isn't a problem for me, because I spent a year in Spain, but the accent and vocabulary might throw some people off. I think the order of topics is a little weird, and there is a lot of school-related vocabulary near the beginning. We're supplementing this program with watching Destinos free online from the Annenberg Foundation.
You can order it from The Book Depository and get free shipping to the US. The actual cost of the book will vary somewhat with the exchange rate. Right now, it costs about $22 and the audio CD (which you really need) is about $55. But you can't order from them right now, because of the volcano! No air freight for a while!