I used eviews professionally for about 9 months because my boss was taught eviews in an econometrics course. We did pretty complex ETL to set up a database of economic and financial time series. Since we used the eviews scripting language, it was a nightmare to code in. No way to run a script from the terminal without opening the GUI, really tough to debug except with print statements, really tough to get help, no community of users, no way to see source code, ugly namespacing and environments, etc. I think it's really risky to use in business because you need solutions which are easy to document, scale well, and are easy to reproduce, and eviews has none of those properties.