1, each of these APP has its own characteristics. All in all it is much cheaper than the physical store. The quality of the problem is also okay, bad can also be returned, sometimes idle trouble is not returned, not as fresh as the physical store.
2, but APP on the other things are quite good, not as good as buying daily necessities and other things can be. I often buy on it, the pickup point is downstairs at home, very convenient. Bring convenience to our life.