[shivensinha4]

- Do updates show immediately (for both directions)?

Yes, changes are apparent immediately.

- What are the limits of read/write queries?

The details are mentioned on https://steinhq.com/pricing.

- What are the limits of rows?

Details available on the pricing page as well. A thing not explicitly mentioned is that you can add any number of rows to a sheet. In append operations, the row limit is not checked.

I'll let you know the other details soon. That's something many have been asking, and I'm deciding what the default behavior should be.