I had a guy over today to install the K40 unit in my SLK350. It took about 3 hours and there was a mishap or two (they're coming back to replace one of the glass circles in front of the spedometer thursday) but I think the result was a pretty clean dash:
All in all I haven't actually passed a speed trap yet so I can't say much about it's sensitivity but I think it's a good install. The pictures actually make the LEDs look brighter than they are; you don't even notice them unless they're going off. And they're flush mounted so they don't pop out. The remote is neat and shouldn't be a problem to toss somewhere -- perhaps it's time to buy the full-width replacement for the ashtray?