[Accumulator]

I can't help with your choice (V1 user here), but I will suggest that you drive cars with each installed. Some warning systems work better for some people; they're just more intuitive. Others, no matter how nice the system is, have you going "huh, what the.." for a moment when you shoudla been on the brakes.

I've driven cars with the K40 systems (of various vintages) and I just never quite got synched to them..probably more me than the systems, but that's how it went. And I couldn't stand having to look down at the display; I just couldn't interpret it with only my peripheral vision and I wanted to keep looking through the windshield.

Make sure you like whichever before spending the bucks and having the car modified, taking a K40 out of a Benz once cost me a pretty penny.

Oh, and I never care much about "ticket guarantees". Getting some $ back is nice, but not getting popped is a whole lot better, especially if you're doing big numbers.