G&G GR-16 R4 Sportline

http://www.airsoftgi.com/product_info.php?cPath=139_24_237&products_id=3748

I am thinking of buying this gun and I have been looking through some of the old topics about this gun and i was wondering if anyone within this community could possibly give me like a mini review of it because i have had some trouble finding decent reviews about it online. So if anyone has prior expireience with this gun or a G&G product and you have any tips or recomendations those would be helpful.

BTW: I am also thinking of purchasing the following with it

grip: http://www.airsoftgi.com/product_info.php?cPath=30_138&products_id=2856

front sight: http://www.airsoftgi.com/product_info.php?cPath=36_119&products_id=2424
I wont be purchasing this from ASGI but i am getting this same product from a friend for less.

battery: http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=439
I am not entirelly sure of what type of battery to get with it so if anyone has a suggestion of a rather cheap battery then just let me know.

Help Please