Opinions. I don't personally think its a good choice. Certainty for emergencies! If your primary light happens to be out of batts and you have no more backup batts in your bag. I mean a flashlight is a click or twist where as cell phone app is unlocking cell phone, finding the app, then turning the light on. I feel it's more convenient to throw a flashlight in your bag or pocket then the fumble round with a cell phone. I don't mean to offend anyone who find the cell phone flashlight is a great idea. This is just my opinion and I would love yours. Thanks guys and gals!