Well this thread is a few months old but here goes...
I've had two K40 systems. I bought the first 4 years ago for my former sportscar. These systems are configured as you please. I installed a detector mudule behind the frint grill and in the rear. In addition, I put a diffuser up front. Warnings were provided by two small piezo speaker/LED pods installed in my instrument cluster. It included a small knob to turn the system on/off and control the volume.
The system performed excellently and I used it at all times during the 17000 miles I drove that car. I compared it to my Escort windshield mounted detector and both worked very similarly in terms of range and selectivity. I got no tix using the system and was saved from tix on several occasions. I drove that car on road trips through FL, TN, AL, GA, VA, DC, NY, NH, CT, KY, MA, MN, SC, NC.
Based on that system, the first thing I did when I bought my current sportscar 8 months ago was to install the new top of the line K40 system, the Calibre. The Calibre is a similar setup to the above wth ine big difference: the Calibre modules interact via Bluetooth. Therefore they don't require drilling to get wires into the central his means less chance of screwing up your firewall when wiring the detector. The Calibre system includes a remote control to establish settings (low/hi volume, city mode, HWY mode). In addition, the Calibre system provides voice or tone warnings. The voice warnings tell you a radar signal's band and the direction it's coming from (i.e. "Ka band, Front"). This all sounds and looks like Nightrider's black camaro (or was that a firebird?), but it works well.
I've now logged over 8000 miles witht he Calibre system, recently driving as far as Canada from Miami. The Calibre system's sensitivity and selectivity are similar to my previous system (and the escort). I do not use the system in states that prohibit detectors (VA, DC, Canada). It can be detected by police in those states. I wrote the company on this point and they recommended just that...turning it off in those states & Canada.
BTW as far as the offer to cover tickets, there are a few catches. You must have the LEO indicate that the ticket was given based on radar reading of your speed. The offer has some logical exclusions (school zones and some others). The original offer with my first K40 system limited the # of miles over the speed limit they would cover. In other words, read the fine print.
Final note...the K40 can be very pricey...my setup cost over $1800. The forst K40 system cost me $1200. As I said before, the $300 Escort has similar protection.
For my bike I have used the Escort wired together with Legal Speeding's Heads Up LED warning light in my helmet.