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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.

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.

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'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

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.

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.

My history with HP calculators goes back to the HP65, back in the 1970s. As the product line changed over the years -- the small 41C, the "landscape" 11c and 15c, the alpha display 32SII -- HP managed to maintain a reasonably consistent and utilitarian style.

More traditional HP keyboard style; very legible keys, nice feel

Display is shiny, less resistant to glare than other models; Minor bugs with trig functions

Yes, I would recommend this to a friend

2 line display; Attractive Design; Clear Display; Easy To Use; Good key layout; RPN

Can confuse theta with 0; No Matrix functions

The HP 35s Scientific Calculator arrived on time and undamaged. The Quick Start Guide was very useful since this was my first HP calculator so I had no idea how to operate it. Within a day I was calculating my Electrical Engineering problems with ease.

+ Easy to operate right out of the box + protective carrying case + FE approved calculator

It would be even better with a bigger screen