Nettles, I built my career making over-complicated models in Excel. I now make simpler models in GSheets.
Some scenario functionality is lost (you cant use TABLE or GOLASEEK) but for basic* static formulae based sheets GSheets does all you need. You can always export as XLS with the click of a button if you need to send it on to someone. But the strength of it is in the collaboration – sharing it with you accountant so they can just login and take what they need any time.
*99% of the functions you are likely to use. I once found an odd circular ref error from a MAX function that didint occur in Excel, but it was easy to fix.
Ive never had that update nag in chrome, andy.