I've just started rebounding and love it. Yes, there is a risk of injury due to balance issues. One of the main reasons I think it's so great for women in general. We tend to loose balance and flexibility as we age. I'm only 42 and and noticed this a couple of years ago.
I just did G-Force 2 today and loved not having sore joints after doing high impact moves. Plus, the cardio benefit is wonderful! I'm sure this guy is correct in his statement, but I feel as though he's stating the obvious. Kinda like "Be careful using Cathe workouts, you use really heavy weights and could drop them on your toe".
There is always a risk when exercising and pushing our bodies past the comfort zone.
Too bad he didn't look into the benefits. Thanks for posting!