Why WebbyFiles ?

How does WebbyFiles compare with other commercial products ?
Why the source code is important ?
How does WebbyFiles compare with Open Source projects ?
The product XYZ looks much better than yours

WebbyFiles Versions

Which are the differencies between the Java and the PHP versions ?
Which version should I choose ? Java or PHP ?

Limitations

Which is the maximum upload size ?
How fast are the uploads / downloads ?