One of the best ETL on the market, worth its (high) cost
I created a BI dashboard for a client of my agency, extracting data from several marketing platforms (from the most common ones as Google and Facebook till more niche ones, used for affiliation marketing), Google Analytics and the client's orders management system to create a comprehensive dashboard highlighting the performance of every marketing channel and allowing to take actions in almost real time to correct the business outcomes.
Configuring it is straightforward: fast, easy, intuitive. It has a lot of connections (you can really import data from any marketing platform, CRM, service and export it to a lot of different destinations).
As an ETL, the "E" and "L" parts are perfect, the "T" could be improved: there's no room for real transformation of the data (you can only perform easy tasks). Scheduling is not possible, which is quite annoying when you are developing business dashboards (and maybe you want you data updated every morning before the 9:30am meeting with the biggest stakeholders of the project).
Reasons for choosing Funnel
It is incredibly easy to setup, it offers loads of connectors, the interface is friendly and needs no training. It is quite expensive, but you gain in time and efficiency.