The controller's construction is of a very high standard and feels great to hold. It is easy to get working and generally feels good to play with.
Unfortunately, the analogue sticks have significant deadzones. What does this mean? When you are playing a game, the analogue sticks will not recognise any input until you have pushed them a certain distance from the centre.
Say you are playing F-Zero X (N64 emulator), which requires very precise changes in direction, you will not be able to make those small adjustments. Even playing Legend of Zelda: Windwaker on Dolphin emulator, I couldn't make the simplest of jumps such as the group of rocks on the water at the very start of the game on Outset Island.
This makes playing almost any game very difficult and frustrating.
It's a shame because the controller is otherwise excellent.
Also bear in mind that the controller is only bluetooth compatible with mobiles. To use it wirelessly with a PC you must use the 2.4ghz wireless dongle.
Excellent product. Good response rate, nice feeling controls, not too heavy. I bought this one for my Amazon firestick so I could side load ROMs on RetroArch. Works quite well, definitely happy with it.