I bought them for Christmas 2020. Now that I have used them for about 1.5 months, I am writing a review for anyone interested in buying them for the next holidays.
4 out of 5 stars and not 5/5, because they don't have any programs, nor do they blink, they are constantly lit. However:
They emit bright and cheerful light. Just by connecting 2 of them, they illuminate a room quite well.
Colors are red, orange, green, blue.
I initially bought 2 pieces, but because I saw in the instructions that they can be connected up to 5 (each one has a socket at the end to connect to another one), I bought 2 more and had 4 pieces. Each one is about 5 meters, so I ended up with a 20-meter long thing. Good if someone wants to make designs or start from one corner of their house and reach the other.
It is described as suitable for indoor and outdoor use, but the truth is that I only used them indoors. I don't know if anyone puts them outdoors, if they will be okay with rain, etc.
The price is very good for what it offers. When I bought them, initially I found them for about €2 per piece and the second batch a little more expensive, around €3.
Attention: it does not come with a transformer, you have to find one yourself (I didn't have trouble finding one on Skroutz).
I was afraid that due to the low price, they would not be durable, but now after 1.5 months, I have been turning them on every afternoon until around 1-2 in the morning and they have held up! I don't know what condition they will be in for the next holidays.