I have the elite edition installed in my E500 and it's proven to be worth every penny. Radar detectors are illegal over here but that doesn't mater because technicaly this thing isn't a radar detector, it's a spectrum analyser. It comes with a computer which uses the spectrum analyser to display allkinds of "usefull" information about your surrounding, including the presence of a radar frequency.
It comes with special software which also alarms you to the presence of a frequency but get this, if a cop pulls you over then you can delete this software at the push of a button.
Because it doesn't opperate like a convential radar detector it's also undetectable by any RDD's (Radar Detector Detector, so a device which detects a radar detector).
It's loaded with a bunch of handy dandy features. The nicest of which is the track control indicator. Over here the police has a system called "traject controle", basicly they're camera's mounted above the road which take a picture of your licenceplate once you pass under it.
A few kilometers ahead there's a same setup. A computer recognizes your licenceplate and measure the time you took to get from point A to point B. It then uses this time to calculate your average speed over the course.
What the track control indicator does is once you pass under one of these camera's, show you your average speed up untill that momment and also show you how fast you can drive to correct your average speed before you reach the second camera.
Another nice feature aswell is police check. There's a database in the device which track of every police radar you've passed, what your speed was at that momment and what frequency the police radar was operating. So if the police equipment is defective or isn't operating within the set frequencies then you can use that as proof.
I can go on for hours about all the nice little features this thing has but trust me it's very handy and I haven't had a momment of regret ever since I bought it.