Here is my rain barrel set-up from summer of 2017. We have two rain barrels.
One is on our detached garage, the other is on our enclosed patio. We decided to do this for a couple of reasons:
First, the water runoff was starting to erode our lawn and this was an inexpensive solution compared to trenching and tapping into the sewer.
Second, it saves us on the water/sewer bill in the summer.
Everything is still working great after a year.
The only improvement I would like to make is to install a "first flush" system. Even though I have the "gutter stuff" in the gutters to filter out debris, there are still small particles that clog the nozzle on the hose.