I have had this particular controller for almost a year and the truth is that it has served me very well! I connect it to an Android tablet (10.6 inches) and an Android mobile phone (about 6.5 inches) via Bluetooth and it works perfectly with the battery lasting for many days! But unfortunately, things are not so perfect.

First of all, after half an hour to an hour of gaming, it starts to strain/tire my hands a lot, to the point where I have to put it down to continue (I have relatively large hands). Also, in my case, the left stick has malfunctioned many times (meaning it moves to the left on its own even if I didn't do anything, etc.), but it gets fixed every time I open it up and clean it with alcohol (maybe because dust accumulates? or maybe because I use it heavily and it develops issues on its own? I don't know the exact reason and this case is very strange).

Additionally, this controller has 3 modes: native Android/x-input, which I use by default for many games with controller support as well as emulators, and it works very well in certain cases, such as Aethersx2, Dolphin MMJR, PPSSPP, Duckstation, Skyline, etc., with some of them automatically mapping. However, in Retroarch on my mobile phone (Xiaomi Poco X3 Pro), for some reason, it has an issue and reverses the A and B buttons, as well as incorrectly or not detecting some other buttons. I'm not sure if the problem still persists because I haven't used Retroarch in a while, but it seems that I'm not the only one with this issue: [Reddit link].

Unfortunately, the X-input mode is not supported via Bluetooth, only with a cable and after pressing a combination. Specifically, you need to continuously press the R1 button before plugging in the USB cable to the device, and if the process is done correctly, the LED 1 and LED 3 will flash. I tried it on a PC and it works normally as if it were an Xbox 360 controller.

It also has another mode that allows you to map controls using an application (shooting plus v3) for games that only support touchscreen and not controllers. The aforementioned application works and does what it says, but it's a bit of a hassle and requires some trial and error to find the best settings. You can save up to four mapping profiles on the controller, and switching between them is done through certain combinations. One problem I had with the application is that when I connected another Bluetooth device (e.g., headphones), it didn't detect the iPega and I had to disconnect all other devices for it to work.

Personally, I believe that if you specifically want it for emulators and native Android games with controller support, then it's worth it. But for anything else, I would only recommend it for those who have a lot of patience. I would prefer it to be larger to fit better in the hands and to have vibration, but I think that would significantly drain the battery.

EDIT

Unfortunately, after extensive use, the right side of the controller has stopped functioning properly. The reason for this is because it has a ribbon cable inside that connects the left and right sides, which is very thin, and the repeated opening and closing of the controller (to properly attach the corresponding device) has caused it to become damaged. In theory, it can be fixed by finding the corresponding cable, but it is still unpredictable how long it will last. It seems that I am not the only one with this problem... watch the following video to understand what I mean: https://www.youtube.com/watch?v=G6gb0pVUNyQ&ab_channel=VicNuman

One of the best purchases for those who want a very good Android gamepad that turns their phone into a Nintendo Switch. The buttons are good, not perfect, but not cheap in touch, decent for its price. The clamp that locks the phone from the back will not loosen, as a friend says in the comments, so don't worry. Although I have had it for over two years, it hasn't suffered the slightest damage. Instant connection via Bluetooth, the battery lasts for over a week of daily use and charges fully in about 3 hours via the micro USB port. There is no lag delay, and most importantly, you can comfortably play FPS games like COD and RPG games like Genshin Impact. Tested and flawless experience. My phone is Xiaomi Mi 11, with a screen size of 6.8 inches, and with the case, it weighs around 300 grams, which is quite heavy. When you lock it with the clamp, it doesn't move at all, becoming a sturdy handheld console. In the emulators I have installed, the buttons are automatically recognized without any problems, without needing to configure them one by one in the settings. For those who find it for up to €40, it is definitely worth it, just make sure it says 9083s as the model, not just the plain version. It is the latest version with some minor upgrades. Happy gaming

Starting this specific evaluation, only one word comes to mind. Pity...
It is a very decent gamepad for tablets (and for mobile phones but mainly for tablets), with a good construction made of quality plastic, with immediate connection to my tablet's Bluetooth, without lag, without disconnections, with excellent response to button presses and analog movements.
However, it has two negatives that ruin it. The least important one is that the "triggers" are simply buttons. Although I could forgive this (after all, you won't be playing any serious simulators on your tablet...), the next one, no matter how much I tried to get used to it, is impossible.
It is about the design of its handles. While all gamepads have handles that "open" outwards, this one, as shown in its photo, has handles that "close" inwards. This results in either having to bend your wrist a lot to hold it properly or having to place your elbows closer together (almost touching) so that the direction of your hands makes the handles fit well in your palms. But in both cases, the hand position is completely uncomfortable. Additionally, the D-pad is quite far to the left from the point where the thumb naturally goes based on the grip on the handle. And so, you end up resting it on your legs so that you don't have to worry about how to hold it.
Therefore, although it is excellent from a technical standpoint, it loses due to its completely "anti-anatomical" design... And especially at the price of 30 euros that is available here, I would not recommend it.