Kanex's MultiSync Mini Bluetooth Keyboard

Is this Kanex MultiSync Mini Keyboard a viable alternative to Apple's own Bluetooth keyboard? It's kind of hard to tell just from photos, but from what I can gather, the keyboard is made from stainless steel (not plastic, already a plus) and features a keyboard layout very similar (if not the same) as the keyboard on an Apple laptop.

The thing that puts this on top of the Apple Bluetooth keyboard for me is the fact that it can be simultaneously linked with up to 4 Bluetooth devices that can be effortlessly switched with the push of a keystroke. The device is rechargeable and ultra-slim. And for $49.95, why wouldn't you buy this over Apple's? I'm really curious.