I have found this calculator very useful from my early college education. It has all the functions required for engineers and other students. I will highly recommend this product for students. Infact I had purchased this calculator during my plus two college time and still I am maintaining the same in a good condition. But it is little heavy and hence difficult to put in a pocket. I like this product and I have an experience of 8 years on this product. Sony is a good company for electronics goods and this calculator is one of that. recommended for all users.