I am very pleased with the wallet. Did you now for about 1 year and the only complaint which the material is concerned, that it is still slightly warped even after one year. Covered the places once in the wallet is something that the wallet a little "bulge" but in my opinion not a great deficiency.
To the calculator I have to say though is a good idea but should here purely of the more fancier. I mean a noble leather case in a very chic look and then a 0.80 cent calculator? Dear ne pocket where you can put their own or use the really good for what.