I have installed 4 channel DVR including 3 bullet and 1 dome CCTV of him vision 6 months ago. I have paid about Rs. 14000 excluding installation labour and installed myself.
First talking about pros, its size is very compact and looks good but best part is it's price is very cheap if compared to Sony or dahua. Video quality is ok.
But in cons part video quality is not enough to HD level. Night vision is also very cheap in quality and it's hard to recognize any object in dark. But due to price many people prefer it. I also purchased it quickly, when price compared to dahua, but after using I found the CCTV video quality is cheap as price.