Classy product. I am using it for more then 3 years. It works perfectly. Go with this. There are another casio 991 ms which has same function and cheaper but that calculator has less screen ratio. It is costly about 100 200 rs but that 200 does not matter while you have this. It is sleem and higher screen ratio gives premium look. It is durable, built quality is also very good. 991 ms is bulky and looks like 82ms calculator while 991Es has classy style. Go for it blindly.