You can find lots and lots of excellent tricks in book. But you will have a very hard time finding SubRosa in print. Because of this I think it is a must if you do card table work. It's devilishly good. And the tutorial video is excellent: Jason England does an amazing job at explaining it and some application ideas (as always).
Be warned, this is not a trick. It's a tool. You combine it to other tricks to create real magic. So, if you are a beginner, I would stay away from it for a while. Also it will require a fair amount of practice to master it. Once you have a sizeable number of tricks you can do at the table, you can use this to kill your audience at the appropriate time.