I have a grand quattro and I am pretty disatisfied by this phone. now lets talk about its different features.
Processor it runs on a 1.2 ghz quad core cortex a5 qualcomm snapdragon 200 and it has gpu andreno 203. its gpu is not bad but its not also good it is something ok and coming ram as ram and processor both combinely give smoothness to the phone.
It has 1 gb of ram which of no use we got only 400 mb free of it. and this phone hangs a lot means everytime you need to wait for some time to load any application. many of times apps stops unexpectedly.
So overall in performance this phone is not good.It runs on on androis 4.1 jellybean which is pretty old version of android as android 6.0 is also out now and this phone don not even get android update for update you need to root your phone which is not good. According to me as this phone quite expensive comparing to the other phones coming with same hardware so this phone should get a android update but samsung is not interest in doing so. and coming to the skin of android which I almost hate. samsung runs its old boring skin every phone without any major difference.
Gaming this phone is absolutely not for gamers but you play some mid level games in it. I am able to run games like subway surfers, agent dash, temple run types of games. but this phone is absolutely not for high end games with lots of graphics. this could not handle such a high end games. so if want play games on your phone then I prefer you not to buy this phone.
this phone is good normal purpose such as calling or chatting etc.
camera
now coming to camera it has 8 mp rear and vga front. I would say that its camera is just ok or something better that ok. but it front camera is worst you can not click good selfies with this phone. if you are a selfie freak then I prefer you not to buy this phone. and it camera has major problem whenever you click photos on this phone the phone hangs for some time so you are unable to see your clicked photos. and coming to its video recordinding its video recording is not good. it can record videos 480p@30fps.
overall
overall this phone is not good. but if you are a brand freak then you can go for it. if you are samsung loyal then you should have no problem in buying this phone.