Characteristic it for some time from the Internet

Small disadvantage: It's completely English (for the point deduction)

That you have to online to use, is not a disadvantage but logical because the amount of information hardly beeen Android device (regardless of whether phone or tablet) would save me. And even if I doubt that those which you may never need faulting prepared several GB of memory on the device would be to sacrifice for functions.

Wolfram Alpha is a tool and not a toy, which is why the online "compulsory" for most users should not be a real obstacle.