I'm a senior engineering student and use a calculator every day.  My peers have every calculator you could imagine, and it seems like like I've played with them all.  I've been using the TI89 for the past 6 years now.  I need a non programmable calc for the Fundamentals of Engineering Exam....and unfortunately bought this guy for $15.  Like others have mentioned, this calc does not register every button entry when typing at normal speeds.  For $3-$5 more you can purchase the TI36X Pro which will register your clicks AND features 4 lines of text instead of 2. Not sure why this thing exists.  The weight, build quality and look of the 36X far exceeds that of the 30X.  SO if you are purchasing this for one of those tests that will make or break your career do not hesitate to spend those three extra Washingtons.