I found these to be great. Cheap, effective and long lasting. We have had these going in my sons and daughters room now for almost 3 years and they just keep on working, no dimming or lights going out.
However they are really hard to install and not easy to change direction (ie corners of walls). They have 90 degree splitters but you have to be a whiz at connecting them. I eventually got it but felt lucky. Again cheap as they come so I won’t complain too much, and they work great.