I bought a galaxy j2 ace last week, hoping it to be a good phone but I am very disappointed.
It has a 5 inch display with a resolution of 540 by 960 which is really low as compared to other phones that provide a fullHD display at this price.This phone has a 1.4GHz quad core processor which does not perform well.I have experienced occasional lags.Sound level is below average.You could even miss some calls.Phone looks stylish externally but is not at all good internally.
Lastly, I would suggest you to buy some other phone because obviously you want to spend your money on something worthwhile.