You can pair the keyboard with other Logitech devices with Unifying receiver technology. No more multiple receivers. Well worth the money.
Take up very little space compared to full keyboard, yet functions big like full keyboard; With its integrated touch pad, you can easily control your HTPC from a distance, and you dont lose function keys like some tiny HTPC keyboards
None; Very satisfied with the purchase; Except that Im still used to mouse instead touch pad; Nut for HTPC control, you are not going to use a mouse, do you