I've always said that shooters on mobile phones is a lousy idea and smartphones are not real gaming devices. Flydigi Stinger should be the standard way shooters are played on mobile. Currently PUBG/Fortnite are getting kind of big on mobile. This would be a great way for players to play their game while on the go and be killing it (pun intended)
The device is also super cheap and anybody can afford it (especially at the discounted price) and thy even have a patented technology. Cant name any cons. It's just made by gamers for gamers and it seems like it just works.