professional system, no single chain

Multiple has already referred to the professionalism of this system, I can confirm - it's not cheap, but also not as it looks.
Do you have to buy each extension a starter pack, then it's expensive - but the system is probably not intended. You should already have multiple extensions per starter.
For durability: use the system for some years and had only one failure, one of the first chains gave up after 3 years, the other from the first series to do well this year continue your service.
For color: The blue is quite intense, a little too pale, but is very good for the ice blue of Father Frost.
For the other colors: it is incomprehensible that there are Amber and Blue, but in Anglican space traditional colors red and green not. LEDs in these colors are probably commonplace. That it would be possible to prove the colorful chains.
Among the white varieties: best convince these when mixed - yields a virtual glitter effect, when the wind, the light spots moved - as the night sky as the stars shine so well in different shades of white.
One star deduction for the missing colors, another for the little too pale blue - technically the product is absolutely convincing.