The microscopic 10cm cable for charging via USB that comes with the kit has only 2 pins, so you can’t connect it to a computer (only for charging). Moreover, standard micro-USB wires have a thicker layer of plastic, so they don’t fit into the clock (the connector is recessed), if you sharpen this plastic, then the clock will enter and there will be a connection not only for charging.
The screen is touch-sensitive, but small and it is difficult to hit the inscriptions and pressing does not always work.
There is a camera, but this is some kind of joke, since it is even worse than on cheap push-button phones (although it would seem much worse).
The SIM slot is difficult to open, and you can break it inadvertently. If you insert a memory card, it is very difficult to pull it out later.
The watch is not very tight, it is better that there is no water close to it. The USB connector is covered with a rubber plug that hangs on a thin rubber thread, I think it will quickly fall off with frequent use.
There is no vibration, inside the case you can see an empty place under the motor. The pedometer does not work, it comes up with the number of steps itself, if you put the watch on the table, it will increase the step counter. The applications have WhatsApp and Twitter (did not try to open), but there is no calculator and browser. (Apparently because of the 3MB firmware version).
Perhaps this is the most cheaper version, and if you take it more expensive, it will be better, but this is not a fact at all.