Overall Satisfaction with Tableau Desktop
I've developed dashboards for sales and marketing using Tableau, as well as supervised others building dashboards. I generally find it very easy to use. The online tutorials are extremely helpful and have gotten me past most issues I've faced. There is functionality that is still lacking that I would like to see. For example, it would be helpful if you could do multi-step aggregation, which isn't available now. This causes the need to do some aggregations outside of Tableau and create another data source.
Qlikview, SiSense - I find Tableau to be more intuitive. I found the others to have a steeper learner curve.
Right now, I'm building on my clients' licenses, but I would definitely renew.
Tableau Desktop is appropriate for anyone who understands basic data structures. It would not be appropriate for people who do not understand these structures, as they are likely to create visually appealing, misleading output.