Yep use them all the time; but also found them nearly impossible to drive onto without at least pushing them out of place, and sometimes one would slide further than the other! So I've long since given up driving on and now just lift the car on to them with a trolley jack.
As for safety, I've seen axle stands start to topple too, if too much lifting (bad) or sideways forces are applied to the car. (Though I'll always try and make sure high torque items where possible are at least cracked loose while the cars tyres are on the ground, even if some load is being taken on a jack.
If I've got both ends of the car raised and one or More wheels off, I'll also put the removed wheel(s) under, or part under the car near where I'm working as a backup; in the insanely unlikely event of it falling off the stands, even if I'm pinned, it will be the wheels taking the bulk of the cars weight, not me!