I just received and used this calculator, and it's a steal. It replaces a much pricier�HP 12C Platinum Calculator, which I'd gotten about five years ago when I needed the more advanced functions. I'd bought two of the HP 12C's, to have one as backup, and they were nothing like the 12Cs of before - the keys malfunctioned on both of the 12Cs within just 25-50 uses (sticking and more often, not registering at all) and there was no easy fix. I've been tolerating them for the last few years, assuming that was just how calculators were made these days, but finally had enough.I just need basic calculator functions now, and for that, the Casio MS-80B is perfect. The interface is incredibly user friendly, the keys work flawlessly (so far), the display is large and clear, and the solar power is a bonus.I also wanted to clear up several question re: the MS-80B's keypad functions. This model does indeed have both an 'off' key and a delete/backspace key, which prior reviews said this calculator doesn't have. The picture currently displayed on Amazon's official product page (as of this review, 6/21/15) is wrong and shows model MS-80S, which lacks these two functions. It's possible that prior reviewers got the wrong model (?).The MS-80B has both an off key and a delete/backspace key, which sit on the top row of the keypad. The backspace key looks like a right-pointing arrow. I've attached a photo of the MS-80B so you can see for yourself.In sum, this is a great basic calculator, for an amazing price. I did a quick search of the other basic models available on Amazon, and this appears to be the best in terms of value, build, and reviews. I can't speak to its long-term durability, but for this price, I don't think you can go wrong!4/7/16 UPDATE: This calculator is used at least weekly and is still going strong. I especially love the large buttons and display, and the solar power. I highly recommend this calculator for anyone who doesn't need advanced functions - from a quality perspective, it easily outperforms my high-end financial HPs (the HPs look more premier, but as I mentioned previously, the models as currently made fail quickly).