This calculator continues to be a standard item at my desk both at home and work for over 20 years now.  This calculator works great, it's very solid and incredibly dependable.  I've bought several over the years but never due to one breaking, only so I could have another at a new desk, or for my wife to use.  My wife learned RPN using this calculator and grew to really enjoy it as I do.  The RPN notation can seem odd at first but once you understand how and why it works as it does, it's very natural and actually saves keystrokes as you use it.