Here are the ""good"" and ""bad"" on this productADVANTAGES.1. USER APPROVED: It is one of two 5-star rated calculators on the Amazon website. Of the two, it has the most user ratings..2. REPUTATION: The SHARP brand has a long history of manufacturing inexpensive, useful, and durable calculators..3. VERSATILITY: For the record, the device has program keys for accountants: COST, SELL, and MARGIN. For all other users, there is an abundance of function keys: GRAD TOTAL, DOUBLE ZEROS, BACKSPACE, and PERCENTAGE..4. USEFUL: Little things make life easier for the operator: automatic power down, two power sources for uninterrupted operation - solar powered and emergency watch battery cell, and mathematical sign changes. The display screen is big - 40+ users are able to see without squinting. Long numbers are broken up with commas after every three numerals..5. ATTENTION TO DETAIL: There are two things that competing models do not have. First, there is a plastic piece on the bottom. Swing it out, the device becomes a tilting desk calculator. Second, push any key down - it makes a sound. Release it - there is another sound. The noise assures the user that the information was registered and accepted by the calculator..6. PRICE: It is only $1 more than the cheapest basic calculator..7. VALUE: No other calculator has such useful features for such a reasonable priceDISADVANTAGES.1. It is missing several useful things: a protective top cover, calendar, world time with day-light savings, alarm clock, stop watch, and ""talking"" - audio pronunciation of numbers and operation.