I recently bought Generation T and was recommended this book later on, so i bought it. I loved Generation T, but thought it lacked in actual 'tops' projects - but lots of other useful things.
This book fills the gap perfectly! It's very nicely laid out with pretty illustrations and simple easy instructions. The ideas are endless, I could never have imagined these, I'm no seamstress!! I can now rescue my favourite tshirts instead of throwing them out/giving them away when they shrink/go out of shape etc
If you are looking for a multitude of things you can make out of a tshirt, then start with Generation T. If you want to make just tops mainly, this is the one to go with, fantastic stuff!