I tried Redash some time ago while I was looking for a very simple "BI" like tool that our non-technical or low-technical colleagues could use (people in Client Satisfaction team).

I settled for Metabase (http://www.metabase.com/ , https://github.com/metabase/metabase ), mainly for the ease of use and installation (a simple java -jar metabase.jar does the trick).

Redash was a close second (one advantage at that time was the ability to have users that could only read queries), but after fighting with it for a while in order to install it, I tested Metabase and haven't looked back since.