We use QlikView to produce a variety of dashboards for the board of trustees, the superintendent, department chiefs and executive management, and employees of certain other departments to assist in monitoring KPIs and other important data quickly, easily, and in ways that have often been difficult or impossible to see before the implementation of QlikView.
While powerful, the syntax of the commands, particularly with respect to dollar-sign expansion and set analysis, can be exceedingly arcane. I can't even remember right off hand how many different duties the dollar-sign is involved in, but it seems like they could have figured out a way to make it a little less confusing. On the other hand, mastery of set analysis, advanced aggregation, and dollar-sign expansion is what separates the men from the boys.
I'd personally like to see a wider variety of built-in chart types.
I haven't used this feature enough to feel qualified to give an honest, meaningful evaluation, but I understand its very good. Take this particular rating with a grain of salt from me and put more weight on the opinions of others with more direct experience.
QlikView is great for the creation of dashboards, but, as is always the case, it has no way of enforcing good design. Study of QlikView should go hand-in-hand with the study of Stephen Few's books on dashboard design and data visualization. For heavy statistical lifting, I think RStudio is a better choice.