Title: Misses keystrokes, tan gives incorrect answers
Product review: I got this calculator because of its large number of features and RPN mode, which I use exclusively. On initial inspection it appears to be great; it's visually attractive, easy to read, and the keys feel good. Unfortunately, it didn't take too long for me to realize that, at least in RPN mode, the calculator consistently misses keystrokes. Keying in 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 rarely gives the correct answer (45). Additionally, I found that the tan function gives slightly incorrect answers at values very close to 90 degrees. Try taking the tan of 90.0000001 and comparing the result you get to what your computer tells you. The tan error is a minor issue for me, but the missed keystrokes makes this calculator unusable.
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