As there are several levels of integration, the whole of the integration is rather seamless — it takes no time to load sheets from EditGrid to Excel, and you can work offline if need be and update at a later time.
EditGrid made the announcement on their official blog:
When people think of compatibility across spreadsheet applications, people tend to think of fidelity — whether the spreadsheet file exported from one application can be imported into another application without loss of quality or detail. While EditGrid has been doing pretty well in this arena, we are not satisfied with this — exporting spreadsheet data from EditGrid into a file means that the data have become “offline”. It means that the user loses something — the ability to get real-time updated data and collaborate with each other online — that the user is entitled to on EditGrid.
It’s a huge step on the way to mainstream usage in industry. I didn’t see this coming, but now that I’m aware of it, it seems like such an obvious extension to the previously strictly online app.
Sign up for the private beta and give the future of spreadsheets a whirl.