Samsung ace launched in 2011 at that time was the best selling phone.though if we compare the festure of this phone from 2017 u all say its bad phone but at that time it performance was very good.
First design good little screen and easy to carry
ram of this phone is only 256mb so and internal memory too not enough so you can not install much apps as that time there was no much craze of this apps.
camera too sounds good as I am using this phone from 6 years so its going smooth
The batttry of this phone is very good till now it gives a better results as I need to charge only once in day n I use whatsup and calling.so good experience to use it till now