Storyline has really taken off since it's initial release, and once you use it, the reasons are clear.
But, the biggest reason for me to recommend Articulate Storyline is ease-of-use. In working with a team of 7 and having one of Storyline's lead competitive products in our department, we saw tremendous issues. Bugs and non-responsiveness of the vendor was one; whereas Articulate's support is second-to-none. But, truly the biggest issue was the learning curve. Most other products, my team would tap out very quickly or create products with a lot of issues because of the complexity. When we got Storyline, it all changed. The team became extremely productive in a very quick period of time with a high level of competence in the tool. All the issues we saw with the prior tools disappeared, and we accomplished more in 6 months with Storyline than we did in the prior 3 years with it's competitor.
I highly recommend a trial so you can experience it for yourself. Recommendations are great, but experiencing the difference yourself will truly allow you to understand the value of the product.
If I had one complaint about Storyline, it would be how it handles responsive web. Of course, this is a judgement call, and the argument on the other end makes a lot of sense- specifically in the area of work that I do regularly (software simulations).
If Storyline allowed software simulations recorded from desktop proprietary software to attempt to render differently for size and orientation of a tablet or mobile device, it would no longer be representative of the software.
So, it's just a judgement call- and in most cases, it makes sense. It just takes a bit of time to orient to the perspective- once you get it, it is actually easy to design for.
I have used Storyline across many industries and companies across softskills and high fidelity software simulations in highly regulated environments. We have been able to create compliant, highly audited simulations that validate skills and report results back to a Learning Management System for deep analysis. Users love the hands-on, and engaging training we create using the product. Developers find it easier to develop these great elearning solutions over competitor's tools.