Not read all the post's on this topic life is to short, but ive never used them or likely to either ,never been stuck but living in the south probably helps. But the main reason why I don't is because you could have the best 4x4 money can buy the best snow/winter tyres fitted but where are you going to drive to with all roads grid locked with numpties spinning there various driving wheels up to maximum revs or sitting on each others bumpers approaching junctions and what not .?