Ranked in these QuestionsQuestion Ranking
Pro Built in rechargeable battery
The SteelSeries Free has a built in rechargeable battery that is charged through a USB cable. This makes it more convenient than a AA or AAA battery powered controller, as you won't have to worry about always having extra batteries on hand. Also, a rechargeable battery is cheaper in the long run.
Pro Small and portable
The SteelSeries Free is pretty small and only weighs 1.91 ounces, meaning it is very pocketable and easy to carry around.
Pro First party app available
SteelSeries provides a free app on the Google Play Store to set up ones device.
Pro 3rd party app support
Con Only two shoulder buttons
Many ports and games utilize four shoulder buttons, meaning some games will not work with this controller.
Con First party app is useless
Apparently the SteelSeries Engine app does not work as advertised and is pretty much useless.
Con The tiny size makes your hands feel cramped after a while
While it's very portable, your hands are going to be squished after playing on it for a few hours.