Bought this a few months ago and use it regularly and still haven't had any problems. The magnetic base sticks directly to the car roof and never falls off. I wasn't sure if it was waterproof or not but figured for the $20+ I paid for it I'd risk it in the rain someday and it worked fine so I leave it on all the time car attached. now and still it never crashed and never stopped working. I'm not suggesting anyone do this but I got tired of taking it off and putting it back on so with all the elements from the outside it was stable on the car and I had no problems at all. The only negative I can think of is that it's a bit noisy as you can hear the motor turning but it lets me know it works and it's not very bright from a distance in daylight but bright enough to and everyone within a few hundred feet will see it quickly and will always see it. I regularly chop down trees along the roadsides, so this has great utility. For the money I think it was a great buy.
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