User spilled a bottle of San Pellegrino into the MBA. It still booted, but would randomly beep and make a loud buzzing noise. I wanted to swap drives into another MBA and needed this tool.
I was not able to get the tools fast enough before the user went out of town. I used Migration Assistant successfully, but had to cross my fingers.
Have one or more of these on hand. They are almost impossible to find in local stores, even here in Silicon Valley.