Conclusion:
The computer offers a lot more than you would normally expect from a calculator. Especially handy is for everyday use, that super fast can convert pints in liters or inches to meters. Great for amateur chefs with English cookbooks or visitors from countries without metric system.
Update 26/03/14
Due to recent events, because the app is now free again: An Internet connection is only required when the app starts. Then you can cut the connection again and use the computer offline.