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I have a couple of them. They're OK. The way it actuates is a little bit bizarre but it sure is effective. Like any traction aid, on a total ice cover it is not quite as effective (since traction sucks for all the wheels), but when you are in a situation where one wheel is on solid pavement and the other is on leaves/mud/gravel/snow/etc., it works like a champ. The problem is, it is easy to make an ass of yourself if you spin one on leaves or wet pavement, since it will engage and spin both, usually causing a big "scrreeeeeeeech" when it does (depending on pavement). On really slick surfaces, all you'll hear is a little "pop" from the rear axle
Although, that is true with any traction aid differential.
The big thing to watch out for is when turning a corner on wet pavement or whatnot. You'll hear a muffled "ccccchunk" and the back end breaks loose pretty easily. For that reason it is good to still monitor wheelspin like anything else. The way I look at it, if you're driving hard enough to get that kind of behavior from the car on all but unexpectedly slick surfaces, you should kind of expect the results.
It is nice in deep snow where one wheel just doesn't cut it. Usually the second wheel--even spinning--makes a nice difference. It's a good piece. I'd much rather have it than not have it.
--
a Brickboard.com Expat
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