I have exclusively used HP reverse polish notation calculators since the Mid-1980's. I am a working engineer and use my calculator a lot. When my old 48G finally died, I bought this as a replacement. Works fine. Been happy so far. The calculator was shipped properly and arrived as promised.

I never liked the 28C (or 28S when it came out 30 years ago) or 48 series as much as the 11C/15C. This model is what the follow-ons should have been, even keeps the orange+blue color scheme.

I'm okay with doing expressions left-to-right, really I am. However, when one of my electronics teachers recommend I try out this thing called "RPN", I eventually did some investigating. Coincidentally, I was also researching how programming was done on graphing calculators.

Clear Display; Easy to Use; Good Value; long battery life; Quality; button feel

The calculator fails if it comes to calculate sine and cosine of pi and pi/2 in RAD mode. Either all my cheaper and more expensive calculators display the correct answer "0", even the Blackberry does. Only THE company of scientific calculators fails here, this is embarrassing.

I absolutely love this calculator. My dad gave me his before and I managed to lose it so I bought another one. For some reason the one I bought seemed to be a bit cheaper in quality but it is still a great tool. It has plenty of options. Very comfortable; it feels solid in your hands.

The HP's main claim to fame is reverse Polish notation support. Some people may find that perplexing, but it allows you to enter long expressions without using parentheses. Expressions are entered from the center outwards. The battery-powered HP features over 100 functions and 800 storage registers.

Very useful pro calculator. Advantages: - No graph function, use computers for what they are good at and calculators to what they are good at, ie a flexible tool - RPN! - Good formula manipulation (with the solve) - Build quality, buttons and chassis seem to be able to hold many years - Good...

If you want a RPN scientific calculator without spending a lot of money, this is probably a good one for you. I didn't want to spend the money on the bigger HP calculators.

I am using this product to study for my FS exam. It seems to give me all the information I need.

Adequate Capabilities; Clear Display; Compact Size; Easy To Use; Powerful; Programmable; Quality Construction

No Polar Conversion; No Rectangular Conversion

When my 41 started getting flaky, I picked up a 33S on clearance at Walmart. I was pleased to find it approved for FE and PE exams, and so is the 35S. I saw a review somewhere else regarding the displays.