Judging the UI and video, it appears they are catering their market towards consumers when I think they should be catering towards businesses. The only time I've used a spreadsheet for personal use was calculating a budget; but there are better apps than Grid for that (Mint).

If I wanted to go camping with friends, I'd call/text/email them and use a text editor to keep track of names and items that we need.

Now if they can get businesses to be productive on their tablets and phones on the other hand....