Summary: I received exactly what I ordered. I tested it right out of the box, and it works great (just like it should). Yes, it was used and had initials engraved on the back. I don't mind it because that gets covered up when you have the cover sitting on the back of the calculator.
Summary: Did exactly what it was supposed to for physics, calculus, etc. Not what I'd use at work (Go TI36X Pro) but this is the only thing I can use on exams. The TI36X Pro can do definite integrals, vectors, matrices, etc. This thing is great for basic math, exponents, logs, etc.
Improved Decimal Point on This Years's TI30XA Model
D. Livermore, Amazon
17 March 2015
Summary: This newer model of the TI30XA actually has a visible decimal point. I took a chance and finally got one of these with a usable read out. The older ones (just a few years back) had tiny decimal points.
Summary: I own at least a half-dozen of these TI-30Xa calculators that I have purchased over the last 10-15 years, but this is the first one I have bought in a few years. TI has changed to a VERY cheap contract manufacturer to make them now and it really shows.