This case works well and allows the LED's to be seen much better than the dark plastic cases. There are light pipes for the LED's but they are not really necessary with a clear case.
Initially I did have some trouble getting the Arduino Uno fitted securely inside the case because there are two tabs which the circuit board needs to be clipped over. There were no instructions so it is a case of work it out for yourself. This did prevent the case from closing fully until I noticed the clips and clipped the circuit board over them. It did function well once completed.
The Uno connections line up fairly well. One header on my Uno is slightly misaligned so comes a bit close to the edge of the case slot but shouldn't be a problem.
I did look at many other cases before choosing this case and do not regret my choice.
Overall a nice little case to protect the Uno for a reasonable price.