Have iterated through multiple builds of Windows 10 technical and consumer preview from 9926 > 10041 > 10049 > 10061 > 10074 > 10122 > 10125 > 10130. Have used Start8 in desktop mode throughout. With Start 10 what I think would be an excellent enhancement would be Windows 7 classic style when in desktop mode and automatically flipping to Start style when in tablet (touch) mode as a configuration option.
Thanks!