In general, these LED lights are good and at a low price.
First, let me clarify that they are not RGBWW as they claim, but just RGBW. That means it has one separate white color (the natural white one). For those who don't know, on the strip there are alternating RGB color LEDs and one W LED just for white. So, this corresponds to 5 wires (+, R, G, B, W) and not 6 like a true RGBWW with two different whites. So, let's not buy the wrong cables and switches.
The white color is very nice and very bright, I think it's 4000K. However, the other colors don't have such strong illumination, but it may be normal. The maximum power consumption they reach is 11Watt/meter, so get a power supply that can handle it and has an extra 20-30Watt capacity, so it doesn't work at its limit. I got a Eurolamp 12V 75W for €7.