PCP works if you don't have the dough to buy the car outright and are prepared to treat the car as a disposable item. At the end you will have to buy it for close to what it is worth or give it back. Whether you do the former or the latter, you won't have a deposit out of it to put on your next car.
I'm not saying it is a bad thing. It can give you now what you would have to save up for. However, the financiers are not in it for altruistic reasons
You also won't get anything like the level of control over when you change the car for another one and you may not find the dealer as well disposed to cut you a mega-deal.