It's hard to envision a single broad usage model for Logitech's new Bluetooth Illuminated Keyboard K810. Here's how Logitech describes it: "A stylish, backlit keyboard with one-touch easy switching between your PC, tablet, and smartphone."
I don't suspect many people wish they had a keyboard handy to swap between those three particular devices, but Logitech is nonetheless onto something with the K810.
I can imagine using this keyboard primarily with a tablet. I can see swapping it between a tablet and a desktop, or perhaps among multiple tablets. It would even make a great living-room keyboard thanks to its tidy, unobtrusive design.
Regardless of its intended use, anyone who buys the K810 will pay a lot for the privilege, given the $99.99 price tag. Those who make that commitment will at least get to enjoy a well-made, attractive piece of hardware. They might even take advantage of its device-swapping capabilities.
Logitech seems to have almost directly targeted Apple's $69 Wireless Keyboard with the K810, an update to the K800 from 2010. Logitech's new keyboard has a metal-and-plastic body; Apple uses only aluminum. The K810 is also a touch wider, and weighs an ounce or 2 more, but in terms of design, from the key layout to the 19-millimeter key pitch to the size of the individual keys, the two are the same.
The K810's keys feel a touch springier than Apple's. Apple's keyboard also uses two AA batteries, while Logitech's relies on charging via an included Micro-USB cable. Logitech says a single charge will last 10 days, which you can extend if you use the on/off switch.
Logitech's keyboard also has a dedicated Windows 8 key, in the same place where you'll find the Option key on Apple's keyboard. Regardless of any OS-specific features, though, both keyboards will work with any contemporary device equipped with a Bluetooth receiver. I successfully connected it to computers running OS X, Windows 8, and Windows 7, as well as multiple iOS devices, an Android-powered smartphone, and a PlayStation 3.
The fact that the K810 is backlit is significant. Apple's keyboard is not, and neither is Microsoft's new Wedge Mobile Keyboard. The backlighting obviously gives the K810 an advantage, and it's made even better by a responsive, convenient sensor system.
The motion sensor automatically toggles the lighting power when you move your hand to the keyboard. Another sensor measures the ambient light level, and adjusts the backlight brightness accordingly. You can also adjust the light output up or down manually via a set of function keys. When you stop typing for a few seconds, the backlight shuts down.