I have attempted to use it 3 times with only 1 success.
The cashiers knew nothing about the program but knew about 'phone coupons'. The coupon is generated after you choose the deals you want from catalogs within the program. The code failed to generate while I was up at the cashier. I was told to go to Customer Service to get the proper refund. I was running late so I didn't get to try it.
My one success was a good one so, I don't consider the app a failure. It has a few bugs to work out but, it looks like it will be a money-saver.
I have other coupon and money saving apps that, for the moment, are better than Target's.
Try it on your phone and see if it works for you.