What does the uptake of Windows 10 look like so far?

It's been just over a month since Windows 10 officially launched - so how many PCs are running the new operating system? According to some sources 75 million is the answer (which is quite low considering the number of PCs out there!). What do you think about the uptake of Windows 10 so far?  What are your customers telling you about their interest in Win 10 for enterprise class devices in the future?