Tableau is one of the leading tools in the area of data analysis for it's extremely rich data visualization capabilities, which makes analysis quite easy and appealing. One might immediately think that Excel has also got rich visualization capabilities as a client tool. Nothing can be rated without a comparison, and I suggest to go through this product tour video of tableau, to get a feel of the data visualization capabilities that it offers. Honestly speaking, I see it as one of the accelerator replacement, if you are not intending to invest into PPS and developer hours to build dashboards and want to equip your business analysts to self-serve data analysis. Also if you want to add the self-service effect with power packed data visualization capabilities, Tableau is one of the top 10 options to consider. Check out this amazing data visualization gallery.
BonaVista Systems, has launched a new product called BonaVista Dimensions. To me this product seems like another version of powerpivot. If you want to learn the rationale, based on what I am making this statement, check out this architecture diagram. In my views, what makes this product different from powerpivot, is the data visualization that it adds to Excel. It can be said that it adds tableau data visualization effect to Excel. I have not done any research into the pricing and licensing details, but what I can say by and large is that if you are looking to powerpack your data analysis using Excel as the client tool with Tableau class data visualizations, this product has the potential to add value to the data visualization and effectively the data analysis department.