Pros
HST has built successful and creative software around optimization and automation of large-scale solar plants. The tech behind this is quite impressive. The companies that license the software are some of the largest solar developers and EPCs in the world. Also, because of the small team, it is possible to wear many hats and learn new skills that might not be available in larger organizations. Work atmosphere continues to be relaxed with a focus on software R&D. Both of the founders are very friendly and easy to get along with.
Cons
The small team size makes it difficult to develop software as quickly as desired. Additionally, HST does not offer the full benefits package that most companies offer (although they do try to compensate for this through higher salaries). This may change as investment increases and the team grows. Some bootstrapping through contract engineering and design work continues to be required to help support the funding of product development.