I've had this light for about a month. I have it in the back window of my unmarked unit. It's plenty bright, its probably good that my back windows are so dark or it might be too bright. Like another review said, the suction cups are extremely weak and I ended up premanently mounting it on the rear deck. They just won't hold for more than a few hours, not sure why. The light seems well built and feels solid. My light doesn't have any of the 'electric flash' patterns shown on the video, but I would say overall its a good light for the money. Much cheaper than a Whelen. I'll probably buy another for the front in the future.
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InciterEX
March 12, 2012
Reviewer:
Keith
from Wisconsin
Great light. Been looking for a led with different flash patterns and a red/ white color scheme. Good price and a powerful light. I would buy another in the future.
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Best I've Ever Owned
January 7, 2012
Reviewer:
Anonymous Person
from Williston Park, NY United States
I have had my fair share of warning lights since I've been a volunteer firefighter, many of them Whelen products, and many others- but none of them compare to the Whacker Inciter EX 4, it is extremely bright both day and night, has great light output off-axis, and the flash patterns are great- I will say I did replace the suction cups with better quality cups, however the light itself is flawless! It's absolutely worth every penny!
Super! 
Whacker 