Kuriaza- Thanks for pointing out the current research. It is always good to be informed. I have heard a bit about it, and was always cautious to only use it for short periods and at the correct hight.
We always used a jolly jumper for our babies but after reading more and more things coming out about the potential damage, we sadly resigned ourselves to not using it any more.

Like a previous poster said, there's nothing wrong with being informed and you just do with the information what you see as appropriate.