Poor QA - Breaks easily.  I've bought two of these in the past 3-4 years.  The first one bit the dust and I figured it was my fault for being too rough with it (but really, I baby them).  The Silver 25th anniversary edition's key's stopped working.  So I bought this one, a plain vanilla 12c, this one's LCD died.  The HP QA and or design on this calculator is lacking.  I love this calculator, but I won't be buying another one because they break from regular use.