“Great little item, works perfectly as expected. I only have two minor criticisms;
1. The switch is quite firm and I find it difficult to turn on/off (although at least there is no chance of it being turned off by accident).
2. The cable on the official power adapter is white, so this on/off switch looks out of place when connected.”
“Does exactly what it needs to do. Fits the standard power pack and eliminates the need to unplug the pi on shutdown which generally just feels tidier and safer. Faultless.”