I have one set up on my P3P and its works great. You can virtually fly as far as you want within the limits of the battery. I had the DBS guys install the antenna to prevent myself from screwing up the controller. They had it installed and mailed back to me the next day.
mine actually fits in the case. I use a go professional case and it just barely fits without having to take the antenna off. It does come off very easily though if you need to remove.