What do you like best?
The open source, free version, and (unrelated) little brother of the known behemoth; can easily accomplish simple operations and complex numeric analysis.
A Standalone, no nonsense, no million plugins needed, and small file; this is a perfect option for either ocasional use (school homework or office) but also robust enough to be a permanent and daily use tool.
Windows, linux and Mac versions available.
What do you dislike?
Needs to add official mobile compatibility at least for proper file browsing/testing and basic editing
Recommendations to others considering the product
Unless you need a very specific, exlcusive Matlab module, Scilab is the little brother that could. As basic, or robust as you needed it to be, it can replace most of the basic or complex numerical analysis that Matlab is used for.
Best of all, free & fully open source. One of the pinnacles of open source software.
What business problems are you solving with the product? What benefits have you realized?
Used it for years, from engineering homework, to basic and advanced numerical analysis in the oil & gas industry.