First thing you'll notice is the increadible noise of the wind screaming in your ears. The closest thing I can find to simulate this is by driving 120 mph on the highway with both your windows down. (don't blame me when you get a ticket this way )
The feeling is kind of like flying. The first jumps you prolly experience less of that; but when once you start practicing turns, going forward & backward and tracking you'll feel more like that
Then there is a whole lot of other things you can't really explain unless you really try it !!
It changes you for sure. You risk your life every time again: IT HAS to change you. For me it gives more meaning to my life and makes me more aware of things in life...
but I reckon' there are as many experiences as jumpers out there