It's about as useful as having an obedient 2nd year CS student with access to a juypter notebook. Which is to say, pretty useful for certain stuff!
You can do flows like:
- Upload CSV of stock data
- "Graph the closing price each day"
- "On the other axis, add a line showing volatility"
- "Filter out to just days with above-average volatility"
etc
Pretty useful for analyzing raw data.