Exactly as it should

I do not agree with the preceding negative comments. As someone that has used the physical 12C for years, this app is true to the original. Using this on the iPad2, I find the graphic quality is stellar. Since using RPN (reverse Polish notation) the first time, I found it logical and straightforward. If youre thinking of buying this app and you havent used RPN before, you owe it to yourself to spend 5 minutes training yourself, youll love it.
Yes, there other free apps that purport to emulate the beloved operation of the HP 12C...and Ive tried pretty much all of them, but this is the one to get. The other "free" apps are all lacking. Today I found this app on sale for $4.99 as a special for the upcoming school year (september) and grabbed it having watched the pricing for 6 months waiting for a price drop.
Kudos to the designers in keeping this app true to the original, 5 stars for sure, 10 if I could!!

Saddle strum about HP 12C Financial Calculator, v2.0.1