Hi Pet,
I answered in another post about the spreadsheets that it is an early alpha. In fact, it should have been hidden by default, but since this release is a beta it is ok that it is visible. Yet, don't expect it to be working fully for a couple more releases.
The development team in charge of this module is doing good progress and it is already looking really nice as you say. They are now working on functions and expressions on cells.
Cheers.