I use a quickjack 5000tl on my S2 all the time. I use the front jack point they tell you not to use, and it's been fine. I had it up on the jacks for a month when I rebuilt the front suspension and another month when I did the front engine service over the winter.
I do use two different rubber block heights for the front and back lift points, but I don't think that's necessary.
I highly recommend the quick jack, I feel safe using it. It is heavy as heck though. Like, I could see someone not being able to manage the weight if they were older or just not that strong.
