Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Back in Business

After 27 years of daily use in engineering design, the HP 41CV I bought in college in 1982 finally died. After looking around for a calculator that had the same features and keyboard layout as the old trusty HP 41CV, I decided to purchase the HP35s. After a couple of weeks of use, I can say that HP has a calculator that operates almost exactly like the older version that I used for so long. The keyboard feel and the reverse polish notation (RPN) logic are what I am accustomed to with my old calculator. The only drawback is that the keypad buttons on the HP35s are not in the same location as on my old calculator, so it will take a little getting used to before I am proficient in using the new device. But if it lasts as long as my first and only HP product, then I'm sure that I figure out the slight changes and will be a pleased HP customer for years to come.