The biggest problem with samsung they onstall their own software in the phone. Samsung install touchwiz that’s why after a months phone starts hanging and gets very slow. Whether A 7 is very good phone because of it’s specification but I don’t think so that samsung improve it’s touchwiz launcher I am tech lover I know very well. You never enjoyed the stock android in samsungs mobile they always installed their own app.
Like samsung chat
Samsung apps etc. So I recommend not to buy any mobile of samsung