I bought the K760 when looking to upgrade my Apple keyboard, and the ability to switch between three different Apple products really appealed to me, as did the design, and the ability to run this wireless keyboard without batteries.
Nice looking product, but it has a few let-downs. The keys are rattly, clicky, and feel cheap next to using an Apple keyboard.
And the lack of Windows support makes this product unusable - I use Bootcamp for development work and for gaming, but this keyboard isn't supported in Windows, so if I wish to use this keyboard with OSX, I then need to keep a second keyboard for when I boot in to Windows. Even Apple's own keyboards work in Windows!
So overall a nice product, switching between devices is a nice idea, but the lack of Windows support rules out any Bootcamp usage, which is a major disappointment.
We can only hope Logitech see the light and provide Windows drivers for this keyboard!