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I just got my one over the weekend now it being the first one I owned I can't compare with anything else but so far I found it to be really responsive running over Bluetooth 2.0 the keyboard its self is ok and the LCD should of been backlit but overall the customizable f keys are a good edition.
The thing that sets the MX5500 apart has to be the laser mouse that thing is so precise and works so good.
I wouldn't recommend the keyboard and mouse for gaming as due to the lag in Bluetooth you would find it a terror to use but if your like me and use it for editing and home theatre setup its perfect use.
an ideal situation would be having the Logitech Di Novo keyboard with the MX revolution mouse
Most European countries have identical keyboard layouts to ours so unlike the US one they'll behave perfectly normally when set to the UK layout, although of course the markings are different (which I guess isn't a concern if you're spending this much on a keyboard).