It's really hard to put to scale or gauge the safety of skydiving. I did it last summer and as scary as it was beforehand and leading up to it, I actually felt very safe once we jumped out of the plane. As far as the precautions they take, it makes it a much safer experience but the fact that you are falling out of a plane from a very high altitude makes it a very unsafe act.
Like mywikistep said, it's more of a risk.
Anyway, I found it very exciting and I thought it was worth the risk despite how scary it was leading up to it.