Door Poppers Question

I am thinking about having door poppers installed on my car, but I really do not know that much about them. I was just wondering if anyone could tell me the details about them and if you like the look? Also who could I get the kits from, are there ones that are better than others, and how much is it going to cost me?
I recently heard of a new technology that is currently being developed that is not yet on the market that allows you to activate the poppers by just touching the metal on the door in a certain spot outside the door. Would this be a good way to activate the poppers?