I got the tech air race when I started racing. I hoped never to use it, but I just got it recharged a second time after the 4th deployment. In two crashes, the air bag deployed optimally and I walked away with nothing but bruises despite some flying and moderately hard impacts. The other two times I'm not sure whether it deployed before or after initial impact and I did suffer some injuries (ribs once, collarbone the other time). Even if it's not perfect, I feel safer with the airbag than with just the back protector and definitely no worse off, so I consider it worthwhile.