I also have a set of these, I use them as a backup set to the fixed leg ones I have.Thanks zulu, I am a bit paranoid about it tbh, I have these axle stands which I bought years ago, from halfords I think, there rated for 2000kg, so I Presume they would be OK?
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If I'm going to be working completely underneath either the front or rear of a vehicle I use 4 stands, kind of a safety plan just incase one of the other stands slips off. And it does happen. You could also leave the jack in place if it's not in the way, just lower it a bit so the vehicles weight is on the stands.
Something to be very careful of is rocking the vehicle, easily done when swinging on a stubborn bolt, metal on metal slips surprisingly easily regardless of however many tonnes are pressing down on it.
Its a good idea to put a block of wood (20mm thick approx) between the axle stand and the chassis.