[quanto]

I noticed that your comment contains no complaint about Gurobi's performance. For comparable problems, was Gurobi superior in solution convergence speed or the quality of the solution itself?

Gurobi, AFAIK, is considered the leading edge of the field, and other tools, especially open-source ones, do not perform as well.

I cannot speak specifically for your firm and use cases, but in my experience, if the use cases are structured and specific enough, rolling out a in-house optimizer is not such a bad idea.

[Tarrosion]

Gurobi had excellent speed for us, but we didn't notice a difference between Gurobi and open source tools on final solution quality; all the linear solvers we've tried get to certifiable optimality on our problems, some just faster than others.